API Create does not support multiple records

[NeilBurkholder]

For bulk creating of data rate limiting becomes an issue because the Create method only accepts a single record. Add Create methods that take an enumerable of records.

[NeilBurkholder]

I would like submit a pull request for this. @patricoos Can you add me as a contributor?

[chiminhtathoj]

@NeilBurkholder Could you share how you did it with me