Initial move from old twain-in-dotnet.

NTwain/Triplets/WhatsThis.txt

@@ -0,0 +1,19 @@
+All TWAIN operations are done through the a combination of 
+Data Group (DG), Data Argument Type (DAT), and Message (MSG) 
+triplets. Rather than letting consumers of this lib deal 
+with all the combinations themselves and risk passing the 
+wrong thing, all defined triplet combinations are simply 
+made available under this namespace.
+
+Example:
+To get the status of the DS, just use the 
+"Get" method (represents MSG), in the
+"Status" embedded class (represnts DAT), in the
+"DGControl" class (represents DG).
+
+or better explained in code:
+
+DGControl.Status.Get(...)
+
+and that's the triplet at-a-glance. Only triplets used by the
+application are explicitly defined this way.