add EqualByValues<T> little class

[andriyshevchenko]

I've added a EqualByValues<T> class, which determines whether two (any-size) sequences have equal members, and the order of elements doesn't matter.
I've also added some test, but unfortunately unable to run them. I've tested with MsTest.

[andriyshevchenko]

For example, gives True:

var coll1 = new string[] { "Hello", "Apple", "C#", "Java" };
var coll2 = new string[] { "C#", "Hello", "Apple" };
Assert.IsTrue(new EqualByValues<string>(coll1, coll2).Value());

and gives False:

var coll1 = new string[] { "Hello", "Apple", "C#", "Java" };
var coll2 = new string[] { "C#", "Hello", "Apple", "Lisp" };
Assert.IsTrue(new EqualByValues<string>(coll1, coll2).Value());

[andriyshevchenko]

Sorry, i'm unable to determine why it doesn't build, my Ide builds it successfully