Adding the project for code injection and XSS vulnerability testing

This project is designed to help developers understand and mitigate code injection and XSS vulnerabilities. It includes a backend API and a frontend interface for testing various attack vectors in a controlled environment.

frontend/.gitignore

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+# React & Node.js
+# Node dependencies
+node_modules/
+.pnp.cjs
+.pnp.loader.mjs
+
+# Build outputs
+/build
+/dist
+/dist-ssr
+/.next
+/out
+/.parcel-cache
+/public/build
+
+# Local environment files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+.env.*.local
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+# Testing
+/coverage
+coverage/*
+/.nyc_output
+
+# Misc
+.DS_Store
+.vscode/*
+!.vscode/extensions.json
+.idea
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+node_modules/