Add Third Party Notices and Contributing

CONTRIBUTING_EN.md

@@ -0,0 +1,7 @@
+# Contributing
+
+## If you are interested in contributing, here are some ground rules:
+* Talk to us before doing the work -- we love contributions, but we might already be working on the same thing, or we might have different opinions on how it should be implemented.
+
+
+## Once you have a change ready following these ground rules. Simply make a pull request

Readme.md

@@ -259,4 +259,8 @@ Windows 版 3 系と 4 系 (32bit & 64bit)、Mac 版 (4 系のみ) に対応し
 - [BlendShapeBuilder](https://github.com/unity3d-jp/BlendShapeBuilder): Unity 上で BlendShape を構築できるようにするツール
 
 ## ライセンス
-[MIT](LICENSE.txt), ただし Blender プラグインは [GPL3](Plugin/MeshSyncClientBlender/LICENSE.txt) (Blender のソースの一部を使っているため)
+- [MIT](LICENSE.txt)
+- [Third Party Notices](Third%20Party%20Notices.md)
+- [Contributing](CONTRIBUTING_EN.md)
+
+

Readme_EN.md

@@ -245,4 +245,9 @@ Also, dll is different in version 4.7 and later. This is due to changes to the b
 - [BlendShapeBuilder](https://github.com/unity3d-jp/BlendShapeBuilder): Tool for building BlendShapes in Unity
 
 ## License
-[MIT](LICENSE.txt), the Blender plugin license is [GPL3](Plugin/MeshSyncClientBlender/LICENSE.txt) (because a portion of the Blender source code is used)
+- [MIT](LICENSE.txt)
+- [Third Party Notices](Third%20Party%20Notices.md)
+- [Contributing](CONTRIBUTING_EN.md)
+
+
+