add first commit

example/router/subtract.py

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+import time
+
+from chongming_worker import rpc_method
+
+from ..models.pydantic import (
+    SubtractGetResponse,
+    SubtractGetRequest,
+)
+
+@rpc_method(
+    subject="example.subtract",
+    method="GET",
+    summary="Subtract two numbers",
+    response_model=SubtractGetResponse,
+) 
+async def subtract(subtract_get_request: SubtractGetRequest) -> SubtractGetResponse:
+    """减法运算：a - b"""
+    return SubtractGetResponse(
+        result=subtract_get_request.a - subtract_get_request.b,
+        operation="subtract",
+        timestamp=time.time(),
+    )