add example

example/example_1.py

@@ -0,0 +1,31 @@
+from flask import Flask, g
+from schema_validator import validate
+from dataclasses import dataclass
+
+
+app = Flask()
+
+
+@dataclass
+class Req:
+    name: str
+    age: int
+
+
+@dataclass
+class Response:
+    name: str
+
+
+@app.post("/test")
+@validate(query=Req, body=Req, responses=Response, tags=["test"])
+def new_model():
+    """ tags only for swagger """
+    body = g.body_params
+    query_params = g.query_params
+    print(body, query_params)
+    return Response(name=123)
+
+
+if __name__ == "__main__":
+    app.run()