feat(User Management): add service to project

[padamstx]

PR summary

This PR adds the User Management service to the project.

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

Merging #43 into master will decrease coverage by 0.01%.
The diff coverage is 93.87%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   94.34%   94.32%   -0.02%     
==========================================
  Files          14       15       +1     
  Lines       13570    14027     +457     
==========================================
+ Hits        12802    13231     +429     
- Misses        768      796      +28     

Impacted Files	Coverage Δ
ibm_platform_services/user_management_v1.py	93.85% <93.85%> (ø)
ibm_platform_services/__init__.py	100.00% <100.00%> (ø)

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[ibm-devx-automation]

🎉 This PR is included in version 0.11.0 🎉

The release is available on GitHub release

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