Add stub on how to launch libreoffice calc

source/2/2.2/2.2.2/libreoffice_calc.rst

@@ -0,0 +1,8 @@
+Chapter 2.2.2 Libreoffice Calc
+==============================
+
+Libreoffice Calc is a spreadsheat program included by default in Lubuntu.
+
+How to launch
+-------------
+To launch libreoffice calc in the menu go to Office -> Libreoffice Calc or run localc from the command line. 

source/2/2.2/Office_Applications.rst

@@ -5,6 +5,8 @@ Chapter 2.2 Office Applications
   :maxdepth: 2
   :titlesonly: 
 
+  2.2.2/libreoffice_calc
+  2.2.3/libreoffice_impress
   2.2.4/libreoffice_math
   2.2.5/libreoffice_writer
   2.2.6/qpdfview