License stuff and README update

LICENSE.md

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+Copyright 2022, Bussun and Luma contributors
+
+This license grants you the right to use, copy and redistribute the software **BINARIES**
+(here the Luma text editor) if the following conditions are met:
+ - No commercial use
+ - A copy of this license is included
+ - A link to the repository and GitHub pages is included
+
+This license also grants you the right to edit the software if the following conditions are met:
+ - You must keep this license
+ - Any change you want to make public must be pushed to the main repository*
+(*This means you can't redistribute a fork of this software)
+
+The main repository of this project is located at: https://github.com/Bussun/BMGEditor
+
+To avoid useless forks, just DON'T make one (even if you want to contribute) You are encouraged
+to commit to the main repository.
+
+If you plan to use some parts of code from this project, you are allowed to if you credit it.
+The software and its source code is provided "as-is" without any warranty 
+of any kind (I still hope it will be useful :) )
+
+This license is subject to change.