README: Updated to Markdown and tweaked a little.

README.md

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+# PhysicsFS
+
+PhysicsFS; a portable, flexible file i/o abstraction.
+
+- Homepage: https://icculus.org/physfs/
+- GitHub: https://github.com/icculus/physfs/
+- Documentation: https://wiki.icculus.org/PhysicsFS3/
+
+PhysicsFS is open source under the zlib license. Please see LICENSE.txt for
+licensing information.
+

README.txt

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-
-PhysicsFS; a portable, flexible file i/o abstraction.
-
-  https://icculus.org/physfs/
-
-Please see the docs directory for documentation.
-
-Please see LICENSE.txt for licensing information.
-