fix: Add missing fs import for file handling (#424)

* fix: Add missing fs import for file handling

* refactor: change fs import style to ES module syntax

Author: SGNayak12

README.md

@@ -52,6 +52,7 @@ const model = genAI.getGenerativeModel({ model: "gemini-1.5-flash" });
 3.  Run a prompt
 
 ```js
+import * as fs from 'fs';
 const prompt = "Does this look store-bought or homemade?";
 const image = {
   inlineData: {