chore: import upstream snapshot with attribution

examples/snippets/servers/basic_prompt.py

@@ -0,0 +1,18 @@
+from mcp.server.mcpserver import MCPServer
+from mcp.server.mcpserver.prompts import base
+
+mcp = MCPServer(name="Prompt Example")
+
+
+@mcp.prompt(title="Code Review")
+def review_code(code: str) -> str:
+    return f"Please review this code:\n\n{code}"
+
+
+@mcp.prompt(title="Debug Assistant")
+def debug_error(error: str) -> list[base.Message]:
+    return [
+        base.UserMessage("I'm seeing this error:"),
+        base.UserMessage(error),
+        base.AssistantMessage("I'll help debug that. What have you tried so far?"),
+    ]