Create Table Repo, corresponding java class and hibernate mapping file

Columns:
* `int id` (one will be automatically generated for now. This will change to the id that github uses for the repo after we start working with tying into github)
* `String githubURL` 
* `String name` (the name of the repo)
* `String status` (pending, inProgress, complete, cancelled)
* add hibernate mapping file as a resource to hibernate config file