README, Makefile, and license headers

[gph-cmath] / README.md

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+gph-cmath: C math library for graphics
+======================================
+
+About
+-----
+gph-cmath is a C math library for graphics programs. It provides a plethora of
+operations on vectors, matrices and quaternions, among other things.
+
+It's conceptually a companion to my C++ math library
+[gph-math](http://github.com/jtsiomb/gph-math), but where gph-math is designed
+with intuitiveness and ease of use as the main priority, this C version is
+designed to be as low-overhead as possible, making it more suitable for more
+resource-constrained target systems.
+For instance most functions modify their first argument, instead of doing an
+extra copy to provide a more natural 3 operand interface. Leaving the copy to
+the user for the cases where it's necessary.
+
+License
+-------
+Copyright (C) 2016 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software. Feel free to use, modify, and/or redistribute it
+under the terms of the MIT/X11 license. See LICENSE for details.
+
+How to use
+----------
+There's nothing to build. All functions are static inline, defined in the header
+files. Either type `make install` to install them system-wide, or just copy all
+files under `src/` to your project source tree.