Merge pull request #19 from powdr-labs/update-readme

Update readme

Author: kuzdogan

README.md

@@ -1,5 +1,35 @@
 # Powdr Labs Website
 
+## Adding posts
+
+You can write blog posts in Extended Markdown (`.mdx`) format nicely. Create a `.mdx` file under `data/blog`. The file name will be the slug of the post. E.g. if you create `my-blog-post.mdx` the post will be at `powdr.org/blog/my-blog.post.mdx`. Alternatively you can create a folder `/my-blog-post` and add an `my-blog-post/index.mdx`.
+
+Easisest is to check out some examples. See https://tailwind-nextjs-starter-blog.vercel.app/ for example posts. Source code of the posts are [here](https://github.com/timlrx/tailwind-nextjs-starter-blog/tree/main/data/blog).
+
+The part above the `.mdx` file is called a "frontmatter":
+
+```
+---
+title: Deriving the OLS Estimator
+date: '2020-12-21'
+draft: false
+summary: 'How to derive the OLS Estimator with matrix notation and a tour of math typesetting using markdown with the help of KaTeX.'
+layout: PostBanner
+bibliography: references-data.bib
+authors: ['default', 'sparrowhawk']
+images: ['/static/images/canada/mountains.jpg']
+---
+```
+
+Each post must contain a `title` and a `date`, rest is optional.
+
+Some additional notes about blog posts:
+
+- you can set `draft:true` to see it in your developement environment but not publish it.
+- The default author is "Powdr Labs", you can add additional authors in `data/authors` and refer them in `authors` in the frontmatter.
+- The default post layout is `PostLayout`. You can see the layouts in directory `layouts/`.
+  To have a post with a banner image use `layout: PostBanner` and add images (typically only one image) in `images: ['/static/images/canada/mountains.jpg']`. The images should be under the directory `public/static`.
+
 ## Installation
 
 ```bash