📝 update readme for google search

README.md

@@ -125,10 +125,43 @@ if (response.data.choices[0].finish_reason === "function_call") {
 }
 ```
 
-<details><summary>Full example code about import { GoogleCustomSearch } from 'openai-function-calling-tools';
-</summary>
-Just 3 steps to use the tools in your OpenAI API project.
-<p>
+### Example 2: Function Calls with Google Custom Search
+
+> 📝 Note: You need to apply for a Google Custom Search API key and a Google Custom Search Engine ID to use this tool.
+
+#### The following is a sequence diagram of the example
+```mermaid
+sequenceDiagram
+  participant U as User
+  participant M as Main Function
+  participant O as OpenAI API
+  participant F as Functions Object
+  participant GC as Google Custom Search
+
+  U->>M: Execute main function
+  M->>M: Initialize configuration and API
+  M->>M: Define QUESTION variable
+  M->>M: Create Google Custom Search tool
+  M->>F: Add tool to functions object
+  loop Chat Completion Loop
+      M->>O: Request chat completion
+      O-->>M: Return response
+      alt If finish reason is "stop"
+          M->>U: Display answer and exit loop
+      else If finish reason is "function_call"
+          M->>M: Parse function call name and arguments
+          M->>F: Invoke corresponding function
+          F->>GC: Perform Google Custom Search
+          GC-->>F: Return search results
+          F->>M: Receive function result
+          M->>M: Add result to message queue
+          M->>M: Output function call details
+      else Other cases
+          M->>M: Continue loop
+      end
+  end
+```
+#### Code
 
 ```js
 const { Configuration, OpenAIApi } = require("openai");
@@ -214,10 +247,8 @@ const main = async () => {
 main();
 ```
 
-</p>
-</details>
 
-### Example 2: Schema Extraction
+### Example 3: Schema Extraction
 
 Example to extract schema from a function call