Add license and readme

README.md

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+Butterflies
+===
+
+Info
+----
+
+Mod by Shara RedCat that adds butterflies.
+
+Please note that this is a work in progress and everything is subject to change.
+
+License
+----
+
+Code for this mod is released under MIT (https://opensource.org/licenses/MIT).
+
+Please see license.txt for texture licenses.

license.txt

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+
+Code License: MIT (https://opensource.org/licenses/MIT)
+By Shara RedCat
+
+---
+
+The MIT License (MIT)
+
+Copyright (c) 2018 Shara RedCat
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+---
+
+
+Textures
+--------
+
+Shara RedCat (CC BY-SA 3.0):
+  butterflies_butterfly.png
+  butterflies_butterfly_animated.png