添加一些描述

readme.md

@@ -0,0 +1,18 @@
+# sql-parser
+
+## 编译
+
+```bash
+$ xmake
+```
+
+## 运行
+
+```bash
+$ xmake run sql-parser "create table tb;"
+```
+
+## 调试/测试
+```python
+python run_test.py
+```