add README

Author: tristanheaven

README.md

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+Secret Maryo Chronicles
+=======================
+
+NOTE
+----
+
+SMC is no longer under active development. However, there is now a
+new game based on SMC:
+
+https://github.com/secretchronicles/TSC
+
+What is it?
+-----------
+
+From the official website at http://www.secretmaryo.org:
+
+> Secret Maryo Chronicles is an Open Source two-dimensional platform
+> game with a design similar to classic computer games. SMC has
+> computer support to a great degree by using an accelerated [Open
+> Graphics Library](http://opengl.org) for the best possible graphic
+> design and stock performance.
+
+It features a wealth of levels, powerups, great music and much more —
+see http://www.secretmaryo.org/index.php?page=about for a more
+comprehensive list. And for those still not getting enough, it
+provides a great in-game level editor.
+
+License
+-------
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.