Add README

README

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+Weather mod for Minetest (http://minetest.net/)
+
+License:
+- Code: LGPL
+- Textures:
+  - Snow cover: WTFPL
+  - Rain / Snow: CC-BY-SA 3.0, credit goes to TeddyDesTodes, from his weather branch at https://github.com/TeddyDesTodes/minetest/tree/weather