Added Database info with column description.

README

@@ -31,4 +31,12 @@ Usage instructions:
 
     Measurement data is dependent on locality, currently  there only exist a placeholder function
 
-    The test result is stored into MongoDB.
+    The test result is stored into MongoDB in the database 'matningar', table 'stability'.
+    Database table:
+    +-----------+-----------------+----------------+
+    |    _id    |    stability    |    position    |
+    +-----------+-----------------+----------------+
+    Column description:
+      _id: Standard MongoDB generated id, so the first 4bits will be a timestamp.
+      stability: mos calculated network stability.
+      position: Placeholder for further development which will integrate positional tracking.