Add React proxy configuration to README for CORS handling between frontend and backend

[Copilot]

Updated the README to include comprehensive proxy configuration instructions for handling CORS between the React frontend and .NET backend during development.

Changes Made

Added a new section "setup proxy for react frontend to communicate with dotnet backend" that includes:

1. Simple proxy configuration via package.json for basic use cases:

   {
     "proxy": "http://localhost:5000"
   }

2. Advanced proxy configuration using setupProxy.js for more complex scenarios:

   const { createProxyMiddleware } = require('http-proxy-middleware');
   
   module.exports = function(app) {
     app.use('/api', createProxyMiddleware({
       target: 'http://localhost:5000',
       changeOrigin: true,
     }));
   };

3. Clear explanations of the port configuration (React on 3000, .NET on 5000)

4. Installation instructions for required dependencies

Why This Matters

The existing README showed how to configure CORS on the .NET backend side but was missing the frontend proxy configuration. This addition provides developers with complete guidance for setting up communication between the React frontend and .NET backend without CORS issues during development.

The proxy configuration is essential because:

• React dev server runs on port 3000
• .NET API runs on port 5000/5001
• Cross-origin requests need proper handling in development

Fixes #1.

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[eklavyamirani]

let's put this under the advanced configuration section

[Copilot]

Done! I've reorganized the setupProxy.js content under an "Advanced Configuration" subsection. Commit 7190ad0

[eklavyamirani]

the proxy should come after setting up the backend application

[Copilot]

Done! I've moved the proxy section to appear after the .NET backend setup instructions (after the CORS configuration section). Commit 7190ad0