Add skeleton README and copy of license text

COPYING.zlib

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+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

README.md

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+# NeHe Legacy Tutorials on SDL_GPU #
+
+Re-implementations of the venerable [NeHe](https://nehe.gamedev.net/) legacy OpenGL
+lessons with SDL3's modern [GPU API](https://wiki.libsdl.org/SDL3/CategoryGPU).
+Lessons 1-10 are currently available in several different languages (C99, Rust,
+and Swift)
+
+### TODO: Document each lesson here ###