Added gemini agent for turn based mode

vocode/turn_based/agent/gemini_agent.py

@@ -0,0 +1,52 @@
+from vocode import getenv
+from vocode.turn_based.agent.base_agent import BaseAgent
+
+import google.generativeai as genai
+import os
+from typing import Any, List, Optional
+class GeminiAgent(BaseAgent):
+    def __init__(
+        self,
+        system_prompt: str = "You are a cat. Your name is Neko.",
+        api_key: Optional[str] = None,
+        initial_message: Optional[str] = "Good morning! How are you?",
+        model_name: str = "gemini-1.5-flash",
+        temperature: float = 0.7,
+        max_tokens: int = 100,
+    ):
+        super().__init__(initial_message=initial_message)
+        api_key = getenv("GEMINI_API_KEY", api_key)
+        if not api_key:
+            raise ValueError("Gemini API key not provided")
+        genai.configure(api_key=api_key)
+        self.client = genai.GenerativeModel(model_name=model_name)
+        self.system_prompt = system_prompt
+        self.messages: List[Any] = [
+            {
+                "role": "system",
+                "content": system_prompt,
+            },
+            {
+                "role": "assistant",
+                "content": initial_message,
+            },
+        ]
+
+    def respond(self, human_input: str):
+        self.messages.append(
+            {
+                "role": "user",
+                "content": human_input,
+            }
+        )
+
+        response = self.client.generate_content(prompt=human_input, system_instruction=self.system_prompt)
+
+        content = response.text
+        self.messages.append(
+            {
+                "role": "assistant",
+                "content": content,
+            }
+        )
+        return content