Update README with instructions to run locally

Author: Chaitanya-Shahare

README.md

@@ -1 +1,45 @@
 # www-new
+
+This is a Hugo-based website. Follow the instructions below to run this website locally.
+
+## Prerequisites
+
+- [Hugo](https://gohugo.io/getting-started/installing/) (extended version recommended)
+
+## Setup
+
+1. Clone the repository:
+
+   ```sh
+   git clone https://github.com/llvm/www-new.git
+   cd www-new
+   ```
+
+2. Initialize and update the submodules (theme):
+
+   ```sh
+   git submodule update --init --recursive
+   ```
+
+3. Install postcss-cli
+   ```sh
+   npm install postcss-cli
+   ```
+
+## Running the Website Locally
+
+1. Start the Hugo server:
+
+   ```sh
+   hugo server
+   ```
+
+2. Open your browser and navigate to `http://localhost:1313` to view the website.
+
+## Additional Commands
+
+- To build the website for production:
+
+  ```sh
+  hugo
+  ```