Add info about installation

Author: DWand

README.md

@@ -1,4 +1,16 @@
 apiDoc Autocompletion
 ========================
 
-A plugin for Sublime Text that adds [apiDoc](https://github.com/apidoc/apidoc) tags to list of code completion suggestions.
+A plugin for Sublime Text that adds [apiDoc](https://github.com/apidoc/apidoc) tags to list of code completion suggestions.
+
+## How to install
+
+With [Package Control](https://sublime.wbond.net/):
+
+1. Open Package Control: Preferences -> Package Control
+2. Select Package Control: Install Package
+3. Type *apiDoc Autocompletion* into the search box and select the package to install it
+
+Manually:
+
+Drop the entire folder in Sublime's `Packages` folder.