Created a proper README

README.md

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+# BMGEditor
+An editor in C# to edit BMG files from Super Mario Galaxy
+
+## Features
+  - Reads and edits message files from Super Mario Galaxy
+  - Allows to add entries
+  - Has a GUI
+
+## What it doesn't do (at least for now)
+  - It can't read (for now) files from the SM3D All Stars version
+  - Events (or whatever they are called) aren't supported at the moment
+  - Editing message files from Super Mario Galaxy **_2_**
+  
+## Issues
+  If you notice aa bug or if you think something's missing, please open an issue
+  
+### Other
+  Please avoid forking the repo if you don't plan to open a pull request later on. Contributions here are welcome