Added README file with a list of libraries.

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+# Single-header-file C libraries
+
+This repository contains some of the small libraries I've created during the
+last few years. More are added as they prove themselves and I have time to
+extract them and clean them up.
+
+All libraries are published under the MIT license.
+
+library               | lastest version | category | description
+--------------------- | --------------- | -------- | --------------------------------
+**math_3d.h**         | 1.0             | graphics | compact 3D math library for use with OpenGL
+**slim_test.h**       | 1.0             | testing  | small set of functions to build simple test programs