Update reference_themes_for_developers.adoc

reference_themes_for_developers.adoc

@@ -1,8 +1,18 @@
 [#themes-dev]
-=== Themes (for developers)
+=== Themes (for theme developers)
 
 include::snippit_earlydoc.adoc[]
 
-OliveTin will load `/theme.css` depending on `themeName:` in your config file. Images and any other assets will be served at `/custom-webui/themes/mytheme/`.
+* Go to https://github.com/OliveTin/theme-template and use this template repository to create your new theme repository on GitHub. 
+* Install OliveTin somewhere, and clone your new repository using `git clone` into your themes directory.
+* Set `themeName: <your-folder>` in your OliveTin config.yaml and restart OliveTin.
+
+Write beautiful CSS to create your theme as you like it, commit your changes to git.
+
+Note thst OliveTin will load `/theme.css` depending on `themeName:` in your config file. Images and any other assets will be served at `/custom-webui/themes/mytheme/`.
+
+When you are done with your theme, fork https://github.com/OliveTin/themes on GitHub and create a new page under the "content" directory for your new theme. Commit that to GitHub and then raise a pull request.
+
+If you meed more help, please jump on our discord server!