add: feature_image to archetype / adding README

README.md

@@ -1,12 +1,37 @@
+## Demo
+
+A demo with feature images is available in the repository [jonathanjanssens/hugo-casper3-demo](https://github.com/jonathanjanssens/hugo-casper3-demo).
+
 ## Installation
 
 ```$ mkdir themes
 $ cd themes
 $ git clone git@github.com:jonathanjanssens/hugo-casper3.git
 ```
 
+Either set the theme in your config to `casper3` or build with the `-t casper3` flag.
+
+## Using the theme
+
+This theme is very image heavy so it is recommended to set a `feature_image` parameter in the front matter of any content.
+
+Posts should be created under the 'post' content type, e.g. `hugo new post/example-post.md`.
+
+## Supported Hugo Versions
+
+The theme has been tested and is working with these versions of Hugo. It should work with others, but if you want to add another officially supported version give it a test and make a pull request to update this.
+
+- 0.55.5
+
+## Development Roadmap
+
+[] Use SCSS from original theme instead of compiled CSS - also needs Hugo Pipes setting up
+[] Multi author support and author taxonomy
+
 ## Support
 
+It would be nice if you leave the credit to me in the footer, unless you make a donation to show support. I can't really police this though, it's MIT licensed anyway so you can do whatever you want with the theme...
+
 If you would like to show your appreciation to me for working on this theme you can <a href="https://paypal.me/JonathanJanssens">donate with Paypal</a> here.
 
 BTC: 1812FGaAJ19hokDoUFP6kK22dzT6zttkw5

archetypes/default.md

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 +++
+feature_image = ""
 +++