Added Value with consturctor and ValueBase empty

Asked by Sasha
task #6 for Dictionary2d  is completed
my changes
Value, ValueBase and IPack implementation

added new class "Pack" inside Dictionary2d.cs
ValueBase values initialized, Pack class as separate file, XML comments added

#6
i have no clue for the moment what Enumerator should return
currently returned values are only what i found matching returning
format
possible its smth need to do about keys matching but currently i dont
follow
Merge pull request #11 from qlynn/medvedchuk

updated Values and ValueBase, implemented Dictionary2d.GetEnumerator, added new Pack class
task #10 for Dictionary2d is completed

1) relationship for keys added.
2)I think so, too and constructor created.
3) Fix.
Merge pull request #10 from qlynn/Andrey

task #10 for Dictionary2d  is completed