Add the jokes

Need to get an initial set of family-friendly-ish jokes to commit to the repo.

For consistency and to go with the name of the site (yomomma.is), jokes should be styled alike.

1. No contraction (yo momma's so fat), use yo momma is so fat.
2. Possessive is allowed (yo momma's breath is so bad).
3. Spelled momma, not mama or any other variant.