Nexus deployment credentials in settings.xml

[commjoen]

This challenge is about packing and explaining why you should not have nexus deployment credentials in your github project hardcoded.
However, we will not have an actual nexus setup right now.

TODO's:

• - Create a settings.xml for Maven to be able to connect to an imaginary Nexus repo See https://github.com/sonatype/nexus-book-examples/blob/master/maven/settings/settings.xml as an example.
• - Implement a challenge that reads the actual challenge secret value from the settings.xml (see contributing.md for more details)

[divyanshuagarwal-23]

Hello @commjoen, I have raised the PR for task 1: #1034
please review

and please assign this to me