update readme.

readme.md

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+将 IDA Hexrays 语法书导出并转换为 codeql 的数据库
+
+```
+ida2codeql.bat 二进制文件目录 保存数据库的目录
+```
+
+bat 的内容
+
+```
+@echo off
+
+set bat_dir=%~dp0
+set codeql_home=%bat_dir%\codeql
+set extractor_path=%bat_dir%\ida-extractor.exe
+
+set ida_path=%bat_dir%\IDA_PRO_7.7\ida.exe
+
+cd /d "%~dp0"
+
+
+if defined CODEQL_HOME (
+    set codeql_home=%CODEQL_HOME%
+) else (
+    echo "使用目录下的 codeql"
+)
+
+set codeql_path=%codeql_home%\codeql.exe
+set scheme_path=%codeql_home%\go\go.dbscheme
+
+
+set binary_path=%1
+set ast_path=%binary_path%\out
+set db_path=%2
+
+python ida-extractor.py "%ida_path%" "%binary_path%"
+python ida2codeql.py "%codeql_path%" "%scheme_path%" "%extractor_path%" "%db_path%" "%ast_path%"
+```
+
+
+
+生成数据库后需要使用 vscode-codeql 的 go 语法写规则.