[DOCUMENTATION] Update README

README.md

@@ -1,14 +1,24 @@
-Fast Backend User Switch Extension
-==================================
+Fast Backend User Switch (TYPO3 Extension `beuser_fastswitch`)
+==============================================================
 
-The beuser_fastswitch extension provides a fast backend user switch for TYPO3 CMS administrator users.
+> The beuser_fastswitch extension provides a very easy backend user switch for TYPO3 CMS administrator users.
 
 ## With just two mouse clicks you can
 
 * Switch to another backend user
 * Edit another backend user
 * Show record infos of another backend user
 
+## Installation
+
+### Installation using Composer
+
+The recommended way to install the extension is by using [Composer](https://getcomposer.org/). In your Composer based TYPO3 project root, just do `composer require josefglatz/beuser-fastswitch`
+
+### Installation as extension from TYPO3 Extension Repository (TER)
+
+Download and install the extension with the TYPO3 CMS extension manager module or via https://typo3.org/ext.
+
 ## Configuration
 
 ### Disable toolbar item for specific backend admin user/-group via UserTSConfig