refactor: refactor EnumsMigration but not finished

Assets/CodeGen/EnumsMigration/README.md

@@ -2,15 +2,53 @@
 
 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).
+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), C# code (for BMapSharp using) and Rust code (for rusty-bmap using).
 
 The steps processing existing enum declaration is called migration as this sub-project name told.
 
+## Usage
+
+This project is consisting of two parts: Enums Analyzer and Enums Render
+
+### Setup Environment
+
+First we stay at the root directory of this project (this README file located).
+And execute `set ENUMS_MIGRATION_ROOT=$(pwd)` on POSIX-like OS, or `set ENUMS_MIGRATION_ROOT=%CD%` on Windows, to set environment variable.
+This environment variable will be used by Enums Analyzer and Enums Render later.
+
+### Enums Analyzer
+
+We should first run Eunms Analyzer to recognize existing enum declarations.
+And export them as JSON file which will be utilized by Enums Render.
+
+#### Build
+
+Enter `EnumsAnalyzer` directory, and execute following command to generate Antlr lexer and parser:
+
 ```
 antlr4 CKGeneralLexer.g4
 antlr4 CKEnumsParser.g4
 antlr4 CKDefinesParser.g4
+```
 
+Keep staying that directory, and execute following command to build Java code.
+
+```
 javac *.java
+```
+
+#### Run
+
+Keep staying this directory, and execute following command to run program.
+
+```
 java MainRunner
 ```
+
+After running, program will process input file located in `Input`directory, and output JSON file to `Intermediate` directory.
+
+### Enums Render
+
+* Enter `EnumsRender` directory and setup it witl Astral UV.
+* Execute `uv run main.py` to run program.
+* Program will process JSON file located in `Intermediate` directory, and output final artifacts to `Output` directory.