Add top-level LICENSE file (Artistic-1.0 + revised TinyMUD notice)

Restate the existing license in a root-level file so GitHub's license
detector recognizes it. Mirrors mux/include/copyright.h and
debian/copyright; no change to actual licensing terms.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,170 @@
+TinyMUX License
+===============
+
+TinyMUX is distributed under the OSI-approved Artistic License (version 1.0).
+Portions derived from TinyMUD additionally carry the revised TinyMUD copyright
+notice reproduced below. Both apply; this file restates the licensing already
+declared in mux/include/copyright.h and debian/copyright, gathered here in a
+single discoverable location. The machine-readable debian/copyright file is the
+authoritative per-file manifest.
+
+
+Copyright
+---------
+
+  MUX Source Code (version 2.0 through 2.14).
+  Copyright (C) 1999-2004 by Solid Vertical Domains, Ltd.
+  Copyright (C) 2005-2020 Stephen Dennis
+
+  TinyMUX Source Code (versions 1.0 through 1.6)
+  Copyright (c) 1995, 1996, 1997, 1998, 1999, David Passmore.
+
+  TinyMUSH 2.2 Source Code
+  Copyright (c) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, Lydia Leong,
+  Jean Marie Diaz, and Deborah Wilson-Hooker.
+
+  TinyMUSH 2.0 Source code
+  Copyright (c) 1991, Joseph Traub and Glenn Crocker. All rights reserved.
+
+  Based on TinyMUD code
+  Copyright (c) 1995, David Applegate, James Aspnes, Timothy Freeman,
+                      and Bennet Yee. All rights reserved.
+  (Modified by these authors from the original 1989, 1990 TinyMUD copyright.)
+
+TinyMUX 2.0 is a derivation of TinyMUX 1.6 which is a derivation of
+TinyMUSH 2.0.10 patchlevel 6.  TinyMUSH 2.0 is dervived from TinyMUD.
+
+There are also portions of source code derived from PennMUSH 1.50.
+
+The TinyMUD copyright follows below.  PennMUSH, TinyMUSH 2.0 and
+TinyMUX 1.6 are now released under the OSI-standard Artistic License.
+
+The files src/pcre.* are derived from PCRE and are distributed under the
+3-clause BSD license; see debian/copyright for those terms.
+
+
+Revised TinyMUD copyright:
+--------------------------
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that: (1) source code distributions
+retain the above copyright notice and this paragraph in its entirety,
+and (2) distributions including binary code include the above copyright
+notice and this paragraph in its entirety in the documentation or other
+materials provided with the distribution.  The names of the copyright
+holders may not be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+
+
+The Artistic License
+--------------------
+
+Preamble
+
+The intent of this document is to state the conditions under which a
+Package may be copied, such that the Copyright Holder maintains some
+semblance of artistic control over the development of the package,
+while giving the users of the package the right to use and distribute
+the Package in a more-or-less customary fashion, plus the right to
+make reasonable modifications.
+
+Definitions:
+    - "Package" refers to the collection of files distributed by the
+      Copyright Holder, and derivatives of that collection of files
+      created through textual modification.
+    - "Standard Version" refers to such a Package if it has not been
+      modified, or has been modified in accordance with the wishes of
+      the Copyright Holder.
+    - "Copyright Holder" is whoever is named in the copyright or
+      copyrights for the package.
+    - "You" is you, if you're thinking about copying or distributing
+      this Package.
+    - "Reasonable copying fee" is whatever you can justify on the basis
+      of media cost, duplication charges, time of people involved, and
+      so on. (You will not be required to justify it to the Copyright
+      Holder, but only to the computing community at large as a market
+      that must bear the fee.)
+    - "Freely Available" means that no fee is charged for the item
+      itself, though there may be fees involved in handling the item. It
+      also means that recipients of the item may redistribute it under
+      the same conditions they received it.
+
+1. You may make and give away verbatim copies of the source form of
+the Standard Version of this Package without restriction, provided
+that you duplicate all of the original copyright notices and
+associated disclaimers.
+
+2. You may apply bug fixes, portability fixes and other modifications
+derived from the Public Domain or from the Copyright Holder. A Package
+modified in such a way shall still be considered the Standard Version.
+
+3. You may otherwise modify your copy of this Package in any way,
+provided that you insert a prominent notice in each changed file
+stating how and when you changed that file, and provided that you do
+at least ONE of the following:
+
+  a) place your modifications in the Public Domain or otherwise make
+  them Freely Available, such as by posting said modifications to
+  Usenet or an equivalent medium, or placing the modifications on a
+  major archive site such as ftp.uu.net, or by allowing the Copyright
+  Holder to include your modifications in the Standard Version of the
+  Package.
+
+  b) use the modified Package only within your corporation or
+  organization.
+
+  c) rename any non-standard executables so the names do not conflict
+  with standard executables, which must also be provided, and provide
+  a separate manual page for each non-standard executable that
+  clearly documents how it differs from the Standard Version.
+
+  d) make other distribution arrangements with the Copyright Holder.
+
+4. You may distribute the programs of this Package in object code or
+executable form, provided that you do at least ONE of the following:
+
+  a) distribute a Standard Version of the executables and library
+  files, together with instructions (in the manual page or
+  equivalent) on where to get the Standard Version.
+
+  b) accompany the distribution with the machine-readable source of
+  the Package with your modifications.
+
+  c) accompany any non-standard executables with their corresponding
+  Standard Version executables, giving the non-standard executables
+  non-standard names, and clearly documenting the differences in
+  manual pages (or equivalent), together with instructions on where
+  to get the Standard Version.
+
+  d) make other distribution arrangements with the Copyright Holder.
+
+5. You may charge a reasonable copying fee for any distribution of
+this Package. You may charge any fee you choose for support of this
+Package. You may not charge a fee for this Package itself. However,
+you may distribute this Package in aggregate with other (possibly
+commercial) programs as part of a larger (possibly commercial)
+software distribution provided that you do not advertise this Package
+as a product of your own.
+
+6. The scripts and library files supplied as input to or produced as
+output from the programs of this Package do not automatically fall
+under the copyright of this Package, but belong to whomever generated
+them, and may be sold commercially, and may be aggregated with this
+Package.
+
+7. C or perl subroutines supplied by you and linked into this Package
+shall not be considered part of this Package.
+
+8. The name of the Copyright Holder may not be used to endorse or
+promote products derived from this software without specific prior
+written permission.
+
+9. THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+
+The End