create_users_db: Create an initial users table
In databrew/portfoliodash: The IFC Portfolio Dashboard

Create a users table in the database

1	create_users_db(users = NULL, connection_object = NULL)

`users`	A dataframewith the columns user_id, name, email, upi, and last_login
`connection_object`	An open connection to adatabase (as created through `credentials_extract` and `credentials_connect` or `credentials_now`); if `NULL`, the function will try to create a `connection_object` by retrieving user information from the `credentials/credentials.yaml` in or somewhere upwards of the working directory.