Add how to open /save files in libreoffice writer.

source/2/2.2/2.2.5/libreoffice_writer.rst

@@ -14,6 +14,10 @@ Version
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 Lubuntu ships with libreoffice writer 6.1.1.2
 
+Useage
+------
+To use libreoffice writer type what you wish to type into the main part of the window. If you wish to save your data press the icon that looks like a floppy disk or press control + s. To open a previously saved document press the button that looks like a folder or press control plus o. To load or save a file from the menu file -> open to open a file or file -> save.    
+
 How to Launch
 -------------
 To launch go to menu -> office -> libreoffice writer or run lowriter from the command line.