Added README

Created README roughly explaining the project with some pictures.

README.md

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+# Shell Texturing
+
+Following the [video](https://www.youtube.com/watch?v=9dr-tRQzij4) by Acerola explaining shell texturing in video games, I decided to recreate it in Godot.
+
+For now this uses a MultiMeshInstance and a custom shader with some basic shading in it.
+
+![Screenshot of Godot with a plane with green grass extruding from it.](grass_overview_v01.jpg "Grass Overview")
+As can be seen here it gives the illusion of grass made of mesh when observed from a high angle. But the illusion breaks when the observation angle gets shallow.
+
+![Screenshot of Godot with a closeup of the grass in a shallow angle. The separate shells are easily visible.](grass_closeup_low_v01.jpg "Grass Closeup")
+

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