Make sure that you have localDB up and running. For development, this project uses localDB. If you are having issues installing local DB, see here.
Alterntively, you could also setup an instance of SQLExpress or you can use a full installation of SQL Server. Just note that if you do any of these alternatives, you'll have to change the connection string.
If you have any issues setting up a local instance of a DB, feel free to reach out to me (Robert).
Feel free to submit a PR request at any time.