Add a Dictionary{TKey,}.TryAdd #211
                
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Add a Dictionary{TKey, TValue} method to the polyfill.
Thanks for the library, it helped me a lot.
BTW, you might want to expand documenation in contributing.md about how to add (how usage should look like) usage of API to
Consumeproject. There is a main chunk of code in the ctor and then there are many unreferenced methods (generally in form {ClassName}{MethodName}). I have just added a method next to other ones for Dictionary in ctor, but it might be good to define pattern how it should be implemented.