Create a developer folder and add samples.

PiperOrigin-RevId: 755885332

contributing/samples/fields_output_schema/agent.py

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+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from google.adk import Agent
+from pydantic import BaseModel
+
+
+class WeahterData(BaseModel):
+  temperature: str
+  humidity: str
+  wind_speed: str
+
+
+root_agent = Agent(
+    name='root_agent',
+    model='gemini-2.0-flash',
+    instruction="""\
+Answer user's questions based on the data you have.
+
+If you don't have the data, you can just say you don't know.
+
+Here are the data you have for San Jose
+
+* temperature: 26 C
+* humidity: 20%
+* wind_speed: 29 mph
+
+Here are the data you have for Cupertino
+
+* temperature: 16 C
+* humidity: 10%
+* wind_speed: 13 mph
+
+""",
+    output_schema=WeahterData,
+    output_key='weather_data',
+)