docs: Add contributing guide

CONTRIBUTING.md

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+# Contributing Guide for Open Science Labs Blog
+
+## Getting Started
+
+To contribute to the Open Science Labs blog, you should first fork the
+repository and clone it locally. Follow these steps to set up your local
+development environment:
+
+```bash
+# Clone your fork of the repository
+$ git clone https://github.com/MY-USER-NAME/opensciencelabs.github.io
+$ cd opensciencelabs.github.io
+
+# Add the original project as an upstream remote
+$ git remote add upstream https://github.com/opensciencelabs/opensciencelabs.github.io
+$ git fetch --all
+```
+
+_Note: Replace `MY-USER-NAME` with your GitHub username._
+
+## Setting Up the Environment
+
+Set up the Conda environment to manage the dependencies for the blog:
+
+```bash
+# Create and activate the Conda environment
+$ mamba env create --file conda/dev.yaml
+$ conda activate osl-web
+```
+
+This will create a new Conda environment named `osl-web` with all necessary
+dependencies and activate it.
+
+## Developing Blog Posts
+
+### Development Commands
+
+- **Previewing Changes:** Use `makim pages.preview` to run a local server for
+  previewing the blog and other pages.
+- **Building the Site:** Before pushing changes to GitHub, build the site using
+  `makim pages.build` to ensure everything is compiled correctly.
+
+### Creating a New Blog Post
+
+1. **Prepare the Blog Post:**
+
+   - Navigate to `pages/blog` and create a new folder with a slugified version
+     of your blog post's title. Use
+     [https://slugify.online/](https://slugify.online/) to generate a slug.
+   - Inside this folder, create your blog post file:
+     - For Markdown: `index.md`
+     - For Jupyter Notebooks: `index.ipynb` (use Jupyter Lab to create this
+       directly)
+
+2. **Include a Header Image:**
+   - Place a header image (either `header.png` or `header.jpg`) in your blog
+     post folder. Make sure the image is under a free license.
+
+### Metadata and Formatting
+
+- **Markdown Posts:** Add a metadata block at the beginning of your `index.md`
+  file:
+
+  ```markdown
+  ---
+  title: "Title of Your Blog Post"
+  slug: "slug-of-your-blog-post"
+  date: YYYY-MM-DD
+  authors: ["Author Name"]
+  tags: ["tag1", "tag2"]
+  categories: ["category1", "category2"]
+  description: "Short description of the blog post."
+  thumbnail: "/header.jpg"
+  template: "blog-post.html"
+  ---
+  ```
+
+- **Jupyter Notebook Posts:** The first cell of your `index.ipynb` should be in
+  `raw` mode containing the same metadata as above.
+
+3. **Building and Viewing:**
+   - If using a Jupyter Notebook, run `makim pages.build` to convert the
+     notebook into a Markdown file (`index.md`).
+   - Add the generated `index.md` to your repository as it will be used to
+     render the webpage.
+
+## Final Steps
+
+Before submitting your blog post:
+
+- Ensure all files are added to your repository.
+- Submit a pull request to the main `opensciencelabs.github.io` repository for
+  review.
+
+Thank you for contributing to the Open Science Labs blog!