Documented development workflow

README.md

@@ -7,6 +7,46 @@ This is a Hugo theme that gets used within all of our websites like our blog,
 documentation and also the redirects. If you commit any changes to the `master`
 branch it will trigger rebuilds of all the related websites.
 
+## Install
+
+You need an existing [Hugo](https://github.com/spf13/hugo) website, than you can
+just download our prebuilt [theme](https://dl.gitea.io/theme/master.tar.gz), put
+it into your `themes/gitea` folder and enable the theme with the
+`theme = "gitea"` option of your website.
+
+## Development
+
+We choose [npm](https://www.npmjs.com/) to fetch our dependencies and
+[gulp](http://gulpjs.com/) for the pipeline. We won't cover the installation of
+nodejs or npm, for that you can find enough guides depending on your operating
+system. First of all you have to install the required dependencies:
+
+```
+npm install -q
+```
+
+After you have successfully installed the required dependencies you should be
+able to use these commands to just clean and build generated sources of the
+theme:
+
+```
+npm run clean
+npm run build
+npm run release
+```
+
+If you want to do more development on the theme we suggest to use the `watch`
+task we have defined to get the changes directly built after saving changes to
+a file:
+
+```
+npm run watch
+```
+
+When you are done with your changes just create a pull request, after merging
+the pull request the theme will be published to our [download page]
+(https://dl.gitea.io/theme) automatically.
+
 ## Contributing
 
 Fork -> Patch -> Push -> Pull Request