Changes: Added mdeclarativecache_mainpage.dox into version control

RevBy: TrustMe

doc/mdeclarativecache_mainpage.dox

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+/*! \mainpage MDeclarativeCache API Library
+
+ \section introduction Introduction
+  MDeclarativeCache API provides way for QML applications to ask already created
+  instances of QApplication and QDeclarativeView classes for themselves. This 
+  helps to reduce application startup time. 
+  
+  <table>
+  <tr><th>Class</th><th>Description</th></tr>
+  <tr><td>MDeclarativeCache</td><td>Class used for storing instances of QApplication
+  and QDeclarativeView.</td></tr>
+  </table>
+ 
+\section getting_started Getting started
+  For writing application which are using MDeclarativeCache, please see the full 
+  developer guide from applauncher-doc package.  
+  
+*/