chore: import upstream snapshot with attribution

contributing/samples/core/empty_agent/README.md

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+# ADK Agent Empty Sample
+
+## Overview
+
+This sample demonstrates how to create a minimal, empty agent using the **ADK** framework.
+
+It defines a simple `Agent` that doesn't have any specific tools or complex instructions attached to it. This is useful as a basic template or starting point for defining more complex agentic behaviors over time, ensuring it follows the core directory requirements of `adk`.
+
+## Sample Inputs
+
+- `go`
+
+## Graph
+
+```mermaid
+graph TD
+    empty_agent[Agent: empty_agent]
+```
+
+## How To
+
+1. Define a basic agent using the `Agent` class, specifying a unique name:
+
+   ```python
+   from google.adk.agents import Agent
+
+   root_agent = Agent(
+       name="empty_agent",
+   )
+   ```