update: Change cards design and write documentation

docs/faq.md

@@ -1,5 +1,22 @@
 ## FAQ
 
-__My question?__
+__How to install this theme__
+
+This theme is available in the official marketplace of Matomo. You have to install the same way as a plugin
+- Go to the administration panel
+- Look for the Marketplace section and select "Theme" in the dropdown
+- Then search for 'Google Theme' and install it.
+- Activate the theme and you're done !
+
+__Is the theme active for all Matomo users in my instance ?__
+
+Yes, if you choose this theme for your Matomo instance, all users will see it.
+
+__How can I contribute to this theme ?__
+
+You can help me developping this theme by contacting me. You can also fork the project and ask for an integration. All way you consider as legit to contribute are welcome.
+
+__How long this theme will be maintained ?__
+
+As long as possible, I have many project to maintain, I'm the first user of this theme and I use Matomo on many project, if I see errors, I'll patch this theme faster as possible !
 
-My answer

docs/index.md

@@ -1 +1,16 @@
-## Documentation
+## Documentation
+
+This theme use LESS to override current CSS. All files and assets are in the "stylesheets" folder at the root of the theme.
+To make it more readable, all differents parts are splitted in the "component" folder.
+
+If you want to contribute, please download the folder and continue in this direction using small and maintainable components. 
+
+Consider this is my first Matomo theme, be compliant and please tell me how to make it better if you see any errors.
+
+### Overrided componants
+- Page card style
+- Dashboard widgets
+- Header
+- Site menu
+- Search bar
+- Sparkline (thank to https://lw1.at for showing the right way)