Added some prefabs with scripts and a prefabs scene to test them
To reviewers;
This pull request contains a lot scenes and unity related changes, so the file changes could be a mess, just need to review the C# script code and README. and verify that every thing is OK in Unity.
To reviewers; This pull request contains a lot scenes and unity related changes, so the file changes could be a mess, just need to review the C# script code and README. and verify that every thing is OK in Unity.