docs: add README for project setup and usage

README.md

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+# rottenblog
+
+This is the source code for [rottenblog](https://blog.rottenwheel.com/). It is a static site generated using [Hugo](https://gohugo.io/).
+
+## Getting Started
+
+### Prerequisites
+
+- [Hugo](https://gohugo.io/getting-started/installing/) installed on your machine.
+
+### Installation
+
+1. Clone the repository:
+
+   ```sh
+   git clone https://github.com/rottenwheel/hugo-rottenwheel.git
+   cd hugo-rottenwheel
+   ```
+
+2. Run the Hugo server:
+
+   ```sh
+   hugo server
+   ```
+
+3. Open your browser and visit `http://localhost:1313` to see the site.
+
+### Deployment
+
+If you use GitHub, this repository comes with a GitHub Actions workflow that automatically builds and deploys the site to the `pages` branch whenever you push changes to the `main` branch.
+
+Otherwise, you can build the site manually:
+
+```sh
+hugo --minify
+```
+
+The generated site will be in the `public/` directory.
+
+## Adding a New Post
+
+1. Create a new Markdown file in the `content/posts/` directory:
+
+   ```sh
+   hugo new posts/my-new-post.md
+   ```
+
+2. Edit the new post file to add your content.
+
+   ```markdown
+   ---
+   title: "My New Post"
+   date: 2024-07-15
+   ---
+
+   # My New Post
+
+   This is the content of my new post.
+   ```
+
+3. Save the file and refresh your browser to see the new post.
+
+## Customizing the Homepage
+
+The homepage content and layout can be customized by editing the `content/_index.md` file and the `layouts/index.html` template.
+
+- `content/_index.md`: Contains the metadata for the homepage.
+- `layouts/index.html`: Defines the HTML structure and layout for the homepage.