docs: add polyfill example in entry configurationAdded a practical example for implementing polyfills in Webpack. Included entry configuration example using core-js and regenerator-runtime Improved documentation clarity for browser compatibility Helps beginners understand polyfill usage Fixes

docs: add polyfill example in entry configurationAdded a practical example for implementing polyfills in Webpack. Included entry configuration example using core-js and regenerator-runtime Improved documentation clarity for browser compatibility Helps beginners understand polyfill usage Fixes #686