feature(#4): signing integration

[lmoesle]

Description

• Signing Integration Service

Reference

Issues: closes #4

Check-List

• [ ] All Acceptance criteria of user story are met
• [ ] JUnit tests are written (60% CodeCov)
• [ ] Internal Review is maintained
• [ ] Documentations external and internal are completed
• [ ] Smoketest successful (Manual E2E-Test depending on Change)
• [ ] No Branch waste left
• [ ] Board is up-to-date
• [ ] Openshift environments are prepared (Secrets, etc.) and release-issue is maintained

[codecov-commenter]

Codecov Report

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

Comparison is base (3ae1da9) 38.50% compared to head (91cc2d3) 38.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## showcase/doXisign #7 +/- ## ==================================================== Coverage 38.50% 38.50% Complexity 1308 1308 ==================================================== Files 598 598 Lines 8671 8671 Branches 424 424 ==================================================== Hits 3339 3339 Misses 5194 5194 Partials 138 138 ``` | [Flag](https://app.codecov.io/gh/Miragon/digiwf-core/pull/7/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Miragon/digiwf-core/pull/7/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | `38.50% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon#carryforward-flags-in-the-pull-request-comment) to find out more.

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[lmoesle]

Aktuell gibt die Integration immer https://doxiview.com/showcase/?locale=de#de&feature=sign zurück. Die doXisign Api muss noch angebunden werden bzw. eine richtige Url zurückgegeben werden.