docs(rules): add commit message rules

Author: sorrycc

.cursor/rules/commit.mdc

@@ -0,0 +1,16 @@
+---
+description: Commit Message
+globs: 
+---
+
+# Your rule content
+
+- Follow Angular Commit Message Spec
+- Format: `type(scope): subject`
+  - type: feat|fix|docs|style|refactor|test|chore|perf
+  - scope: Optional, the scope of the changes
+  - subject: A concise description of the changes
+
+<example>
+feat(auth): add agent command
+</example>