Add a README to start. Not much in it.

README.md

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+# Simple Raycaster Study
+
+This is a study project for me to learn the raycasting technique.  It's an older technique that's
+not really used much but I'm learning game dev historically and it's definitely been used in the
+past (Doom).
+
+I've been told to look into the following as well:
+
+https://en.wikipedia.org/wiki/Gilbert%E2%80%93Johnson%E2%80%93Keerthi_distance_algorithm
+
+