refactor: change repo layout

Assets/CodeGen/EnumsMigration/README.md

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+# Enums Migration
+
+A helper program to migrate existing Virtools enum declarations into other formats.
+
+Original Virtools SDK have various enum declarations. All of them are defined as C format and their formation are not uniform. This sub-project will use laxer and parser to recognize these diverse declarations, extract them as a series of uniform Java data struct and output them as C++ code (as C++ enum class syntax for LibCmo using), Python code (for PyBMap using), and C# code (for BMapSharp using).
+
+The steps processing existing enum declaration is called migration as this sub-project name told.
+
+```
+antlr4 CKGeneralLexer.g4
+antlr4 CKEnumsParser.g4
+antlr4 CKDefinesParser.g4
+
+javac *.java
+java MainRunner
+```