chore(README): add instructions on how to use the theme

README.md

@@ -8,15 +8,20 @@ Fork of the default theme for [Ghost](http://github.com/tryghost/ghost/). _Fanto
 
  
 
-# Specific features compared to Casper
+## Specific features compared to Casper
 
 - Instagram icon and link in the Header, available as a custom setting
 - Github icon and link in the Header, available as a custom setting
 - Table of Contents powered by [tocbot](https://tscanlin.github.io/tocbot/)
 - Hidden Feature Image in Post page according to Access Tier of Member
 - Locales: minimal setup, with translation for japanese (can be expanded to any language by adding a `/locales/<...>.json` file)
 
-# Copyright & License
+## How to use it
+
+- Go to the [Releases](https://github.com/tmlmt/fantome/releases) page and download `fantome.zip` in the list of Assets of the latest release.
+- In your Ghost instance, go to Settings > Design & Branding > Change theme (bottom right corner) > Upload theme (upper right corder) and upload the zip file 
+
+## Copyright & License
 
 Copyright (c) 2013-2023 Ghost Foundation  
 Copyright (c) 2022-2023 Thomas Lamant