add main features

[alphaolomi]

pesa sdk for php

added support for

• customer to business (C2B) single payment
• business to customer (B2C) single payment
• payment reversals
• query transaction status
• direct debit creation
• direct debit payments

Misc

• added docs
• added example and demo app
• added ci/cd
• added

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@02291d0). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #1   +/-   ##
=======================================
  Coverage        ?   96.96%           
  Complexity      ?        9           
=======================================
  Files           ?        1           
  Lines           ?       33           
  Branches        ?        0           
=======================================
  Hits            ?       32           
  Misses          ?        1           
  Partials        ?        0           

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