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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The joke with this kata is that you would normally just use System.Numerics, but you can't use it in your kata solution because (ha ha) you can't add a reference to System.Numerics here.
You will have to basically reimplement your own crappy version of BigInteger in order to make this work (or, at least, your own version of the BigInteger addition operation).