The initial release of the Paystack API library

The initial release of the Paystack API library. The library currently supports:

• Initialising a transaction
• Verifying a transaction.

The next release will be a week from now and will add the following capabilities:

• List Transactions
• Fetch Transaction
• Charge Authorization
• View Transaction Timeline
• Transaction Totals
• Export Transaction
• Partial Debit

What's Changed

• testing pull request by @morukele in #1
• Create rust.yml by @morukele in #2

Full Changelog: https://github.com/morukele/paystack-rs/commits/v0.1.1