Add remittances

[ernest-okot]

Is your feature request related to a problem? Please describe.

This library doesn't currently support the remittances API

Describe the solution you'd like

We need to add a module to support remittances. It should support the following operations

• [ ] POST /token (we need to add an authorizer for this)
• [ ] POST /transfer
• [ ] GET /transfer/{referenceId}
• [ ] GET /v1_0/account/balance
• [ ] GET /v1_0/accountholder/{accountHolderIdType}/{accountHolderId}/active

Reference

• https://momodeveloper.mtn.com/docs/services/remittance

[Byusa]

any progress on this? @ernest-okot @raybesiga

[ernest-okot]

@Byusa we are accepting PRs for this

[luigimorel]

I have started working on this. @raybesiga you could assign it to me? Currently testing and writing tests.