Prepare an user friendly readme

Author: sergeymakinen

README.md

@@ -4,15 +4,67 @@ JetBrains' IDEA/PhpStorm/PyCharm/DataGrip/… theme inspired by the GitHub synta
 
 Tested with:
 
-* PHP
-* Python
 * Bash
-* INI
-* JavaScript
 * CSS
+* Go
 * HTML
+* INI
+* JavaScript
+* JSON
+* PHP
+* Python
 * XML
 
+## How to install
+
+> Shameless rip-off from [this document](https://intellij-support.jetbrains.com/hc/en-us/articles/206544519-Directories-used-by-the-IDE-to-store-settings-caches-plugins-and-logs).
+
+1. Copy [GitHub 3.icls](GitHub%203.icls) to your preferences directory:
+
+    #### Windows Vista, 7, 8, 10:
+    
+    ```
+    <SYSTEM DRIVE>\Users\<USER ACCOUNT NAME>\.<PRODUCT><VERSION>\colors
+    ```
+    
+    #### Windows XP:
+    
+    ```
+    <SYSTEM DRIVE>\Documents and Settings\<USER ACCOUNT NAME>\.<PRODUCT><VERSION>\colors
+    ```
+    
+    #### Linux and other Unix systems
+    
+    Product directory starting with dot can be found in your user home directory, the pattern is:
+    
+    ```
+    ~/.<PRODUCT><VERSION>/colors
+    ```
+     
+    #### macOS
+    
+    ```
+    ~/Library/Preferences/<PRODUCT><VERSION>/colors
+    ```
+    
+    #### `PRODUCT` values
+    
+    * `IntelliJIdea` (IntelliJ IDEA Ultimate Edition)
+    * `IdeaIC` (IntelliJ IDEA Community Edition)
+    * `RubyMine`
+    * `WebIde` (PhpStorm versions before 2016.1 and WebStorm before 7.0 use this common directory)
+    * `PhpStorm` (PhpStorm starting from 2016.1 version)
+    * `WebStorm` (WebStorm starting from 7.0 version)
+    * `PyCharm`
+    * `AppCode`
+    * `CLion`
+    * `DataGrip`
+    * `AndroidStudio`
+
+2. Restart your product.
+
+3. Go to Preferences, choose Editor > Color Scheme and select `GitHub 3`.
+
 ## Screenshots
 
 ![PHP in PhpStorm](Screenshot%20-%20PhpStorm.png)