added code example for html, react and vue

[Ho3einWave]

This pull request includes significant updates to the examples directory, adding new HTML, React, and Vue examples for the MyTonSwap widget. The changes span across multiple files, introducing new configurations, dependencies, and example setups. Below are the most important changes:

HTML Example:

• Added a new HTML example for the MyTonSwap widget with custom styles and script integrations. (examples/html/index.html)

React Example:

• Introduced a new React project with TypeScript and Vite, including the necessary configurations in package.json, tsconfig files, and vite.config.ts. (examples/react/package.json, examples/react/tsconfig.app.json, examples/react/tsconfig.json, examples/react/tsconfig.node.json, examples/react/vite.config.ts) [1] [2] [3] [4] [5]
• Added a new React component (App.tsx) and configured the main entry point (main.tsx) to use the MyTonSwap widget and TonConnectUI. (examples/react/src/App.tsx, examples/react/src/main.tsx) [1] [2]
• Updated ESLint configuration to include React-specific rules and TypeScript settings. (examples/react/eslint.config.js)
• Added a new .gitignore file to exclude logs, build directories, and editor-specific files. (examples/react/.gitignore)

Vue Example:

• Introduced a new Vue 3 project with TypeScript and Vite, including the necessary configurations in package.json and vite.config.ts. (examples/vue/package.json, examples/vue/vite.config.ts) [1] [2]
• Added a new Vue component (App.vue) to integrate the MyTonSwap widget and TonConnectUI. (examples/vue/src/App.vue)
• Added a new .gitignore file to exclude logs, build directories, and editor-specific files. (examples/vue/.gitignore)
• Added a recommended VSCode extension configuration for Vue development. (examples/vue/.vscode/extensions.json)