Test Docs for RefCount,Schema and String Tests

:Release Notes:
 Test Docs for Core Module of DB8.

:Detailed Notes:
 - RefCount Test:
   Tests the functionality of ref counter.
   Atomic Counter is used as the counter in this test case.
   Files: MojRefCountTest.cpp and MojRefCountTest.h

 - Schema Test:
   Tests the Schema functionality supported in DB8.
   It provides a mechanism to validate the JSON data objects.
   Files:MojSchemaTest.cpp and MojSchemaTest.h

 - String Test:
   Tests the String functionality supported in DB8.
   It supports all String operations.
   Files:MojStringTest.cpp and MojStringTest.h

:Testing Performed
 Tested in Desktop
 Note:  Changes to comments only, no logic changes

:QA Notes:

:Issues Addressed:

Open-webOS-DCO-1.0-Signed-off-by: Yasaswini A Y <yasaswini.ay@lge.com>

Change-Id: Ib03056819f25b745ae885afd657fb21344126658
Reviewed-on: https://g2g.palm.com/2857
Reviewed-by: Build Verification
Reviewed-by: Roger Stringer <roger.stringer@lge.com>
Tested-by: Roger Stringer <roger.stringer@lge.com>