Wrote example for 'colors' command

Work done as a team by:
-- V Sowjanya <[e-mail]>
-- N Rajender Reddy <[e-mail]>
-- R Srikanth <[e-mail]>

IPython/core/magic.py

@@ -2374,7 +2374,14 b' Currently the magic system has the following functions:\\n"""'
 
         Currently implemented schemes: NoColor, Linux, LightBG.
 
-        Color scheme names are not case-sensitive."""
+        Color scheme names are not case-sensitive.
+        
+        Examples
+        --------
+        To get a plain black and white terminal::
+        
+          %colors nocolor
+        """
 
         def color_switch_err(name):
             warn('Error changing %s color schemes.\n%s' %