AdfsOrganization: Add Empty Organization Support

[X-Guardian]

Pull Request (PR) description

This PR adds read/write support for an empty contact to the AdfsOrganization resource.

This Pull Request (PR) fixes the following issues

• Fixes #30

Task list

• [x] Added an entry under the Unreleased section in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [ ] Resource documentation added/updated in resource directory README.md.
• [ ] Resource parameter descriptions added/updated in schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [x] Examples appropriately added/updated.
• [x] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov[bot]]

Codecov Report

Merging #31 into dev will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev      #31      +/-   ##
=========================================
+ Coverage   98.3%   98.31%   +<.01%     
=========================================
  Files         16       16              
  Lines       2123     2131       +8     
=========================================
+ Hits        2087     2095       +8     
  Misses        36       36

Impacted Files	Coverage Δ
...s/MSFT_AdfsOrganization/MSFT_AdfsOrganization.psm1	100% <100%> (ø)	:arrow_up:

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