feat: implement initial React markdown previewer application with comprehensive styling.

Author: aadhar41

.env

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+GENERATE_SOURCEMAP=false

.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

README.md

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+# Markdown Previewer
+
+A simple and efficient React-based web application that allows users to write Markdown text and see the rendered HTML preview in real-time.
+
+## Features
+
+- **Live Preview**: See changes instantly as you type.
+- **GitHub Flavored Markdown**: Supports standard GFM syntax including tables, task lists, and code blocks.
+- **Responsive Design**: Works on desktop and mobile browsers.
+- **Syntax Highlighting**: Built-in support for code snippets.
+
+## Screenshots
+
+![Main Interface](public\screens\home_screen.png)
+![Editor View & Rendered Output](public\screens\print_screen.png)
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js (v14 or higher)
+- npm or yarn
+
+### Installation
+
+1. Clone the repository:
+   ```bash
+   git clone https://github.com/your-username/markdown-preview.git
+   ```
+
+2. Navigate to the project directory:
+   ```bash
+   cd markdown-preview
+   ```
+
+3. Install dependencies:
+   ```bash
+   npm install
+   ```
+
+4. Start the development server:
+   ```bash
+   npm start
+   ```
+
+The application will be available at `http://localhost:3000`.
+
+## Technologies Used
+
+- **React**: Frontend library for building the user interface.
+- **Marked**: A low-level markdown compiler for parsing markdown.
+- **DOMPurify**: To sanitize the HTML output and prevent XSS attacks.
+- **CSS3**: For custom styling and layout.
+
+## Project Structure
+
+```text
+markdown-preview/
+├── public/
+│   └── screens/         # Application screenshots
+├── src/
+│   ├── components/      # React components
+│   ├── App.js           # Main application logic
+│   └── index.js         # Entry point
+└── README.md
+```