Payment method update

Version changes.

• [FIXED] Update "Pay with Bank (NG)" endpoint.
• [ADDED] eNaira payment method.
• [ADDED] Pay with Bank Transfer payment method.
• [ADDED] Tanzania mobile money payment method.
• [ADDED] Support for EUR and GBP on pay with Bank method.

Add Guides

• Add community contribution guidelines.
• Add new content for developer docs.
• Add a new structure for better readability.

fixed bug with tracking HashMap

1.2.15

bumped version number

Updated network to allow Airtel and Zamtel in Zambia Mobile Money

1.2.14

updated network for Zambia Mobile Money

Enabled Meta in verify response for Card charge

1.2.13

added meta in verify response for card charges

Added verify method to MoMo super class and enabled Meta in verify response

added verify method to MoMo superclasses and enabled meta in verify r…

…esponse

Added verify method to Zambia MoMo

1.2.11

bumped package version

Added Transfer retries and get Transfer balance to SDK.

1.2.10

added functions for transfer retries

Added Refund method to payment classes

1.2.9

added refund method in Card, Account and MoMo classes

Updated charge params

1.2.8

updated charge params