オリジナルのREADME.txtを復活

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+Copyright (C) 2015 Julian Marchant <onpon4@riseup.net>
+
+Copying and distribution of this file, with or without modification,
+are permitted in any medium without royalty provided the copyright
+notice and this notice are preserved.  This file is offered as-is,
+without any warranty.
+
+========================================================================
+
+
+Thank you for downloading Project: Starfighter! This readme is just a
+basic overview of the game and instructions for building; for
+instructions on how to play the game, see docs/index.html.
+
+Project: Starfighter is a space shoot 'em up game originally developed
+by Parallel Realities in 2002, and released in 2003. You assume the role
+of Chris Bainfield in his quest to put an end to WEAPCO, the weapons
+corporation which has enslaved the galaxy.
+
+If you played one of the versions of Project: Starfighter distributed by
+Parallel Realities, you might notice some differences in this version
+compared to the original:
+
+* The graphics, sounds, and music are all completely different. This is
+  because most of the original media was not properly licensed, and
+  therefore needed to be replaced to make the game 100% libre and legal.
+  Most of this work was done by the previous project at SourceForge;
+  this project completed that work by adding music and replacing one
+  non-libre graphic that got into version 1.2 by mistake.
+
+* There are several gameplay changes. These changes were mostly done to
+  balance the game better. However, if you want the original experience,
+  "original" difficulty approximates it as closely as possible (short of
+  implementing bugs on purpose).
+
+* Typing "humansdoitbetter" in the title screen no longer enables
+  cheats. This is actually because the switch to SDL2 broke the original
+  feature, and rather than fixing it, I just replaced it with something
+  else. I'll let you figure out what the new method to access the cheat
+  menu is. :)
+
+
+COMPILING FROM SOURCE
+
+Project: Starfighter depends on the following libraries to build:
+
+* SDL2 <http://libsdl.org>
+* SDL2_image <http://www.libsdl.org/projects/SDL_image/>
+* SDL2_mixer <http://www.libsdl.org/projects/SDL_mixer/>
+
+Once you have all dependencies installed, simply run:
+
+    make
+
+And optionally (as root):
+
+    make install
+
+If this doesn't work, you may need to tweak the makefile.
+
+To play, simply run the starfighter binary.
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