Adding "About Mattermost" to README.md

README.md

@@ -2,8 +2,7 @@
 **Team Communication Service**  
 **Version 0.40**
 
-What matters most to your team?
-===============================
+WHAT MATTERS MOST TO YOUR TEAM? 
 
 Words have power.  
 Mattermost serves teams who use words to shape the future.  
@@ -11,6 +10,13 @@ The words you choose are up to you.
 
 *- SpinPunch*
 
+
+About Mattermost
+================
+
+Mattermost is an open source team communication service. It brings messages and files shared by your team into one place accessible across PCs and phones, with archiving and search.
+
+
 Installing the Mattermost Preview 
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