docs: update README and add env.example for API key configuration

README.md

@@ -2,10 +2,8 @@
 
 A next.js web application that integrates AI capabilities with draw.io diagrams. This app allows you to create, modify, and enhance diagrams through natural language commands and AI-assisted visualization.
 
-
 https://github.com/user-attachments/assets/b2eef5f3-b335-4e71-a755-dc2e80931979
 
-
 Demo site: [https://next-ai-draw-io.vercel.app/](https://next-ai-draw-io.vercel.app/)
 
 ## Features
@@ -47,12 +45,15 @@ npm install
 yarn install
 ```
 
-3. Create a `.env.local` file in the root directory with the following variables:
+3. Create a `.env.local` file in the root directory. You can use `env.example` as a template:
 
+```bash
+cp env.example .env.local
 ```
-OPENAI_API_KEY=your_openai_api_key_here
+
-# Add any other required environment variables
+Then update `.env.local` with your actual API keys:
-```
+
+Note: Not all variables are required. At minimum, you'll need at least one AI provider API key (OpenAI, Google, or OpenRouter).
 
 4. Run the development server:
 

env.example

@@ -0,0 +1,9 @@
+# add the needed api 
+
+GOOGLE_GENERATIVE_AI_API_KEY="your-google-api-key-here"
+OPENAI_API_KEY="your-openai-api-key-here"
+PERSONAL_ACCESS_TOKEN="your-github-personal-access-token-here"
+AWS_ACCESS_KEY_ID=your-aws-access-key-id
+AWS_SECRET_ACCESS_KEY=your-aws-secret-access-key
+AWS_REGION=your-region
+OPENROUTER_API_KEY="your-openrouter-api-key-here"