added composer part to README.md

README.md

@@ -1,3 +1,33 @@
 # phpbb_updates
 
 Shell Script to update phpBB to current version.
+
+
+Usage: 
+
+Switch into you current phpBB root directory, then
+
+`git clone https://git.24unix.net/tracer/phpbb_updates.git`
+
+Or download either:  
+https://git.24unix.net/tracer/phpbb_updates/archive/v0.0.1.zip
+
+or:  
+https://git.24unix.net/tracer/phpbb_updates/archive/v0.0.1.tar.gz
+
+and unpack them into the same directory and change into phpbb_updates.
+
+Then: Install composer (https://getcomposer.org/download/) and run  
+`composer install`
+
+followed by:  
+`php update.php`
+
+If you are using KeyHelp, replace
+
+`composer install` with `keyhelp-php81 composer install`
+and
+`php update.php` with `keyhelp-php81 update.php`
+
+
+