Add UI for creating a new payment method

[nedjulius]

• Implements the behave scenarios
• Adds the UI to create new payment method

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.65%. Comparing base (b493a86) to head (4963503).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #53 +/- ## ======================================= Coverage 95.65% 95.65% ======================================= Files 11 11 Lines 391 391 ======================================= Hits 374 374 Misses 17 17 ```

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