CMSiteConfiguration- Adds a resource for CMSite

[NEllis280]

Pull Request (PR) description

This PR adds a resource for CMSite.

Task list

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

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This change is 

[codecov[bot]]

Codecov Report

Merging #103 (e75c4be) into master (e75f2d0) will increase coverage by 0%. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #103    +/-   ##
======================================
  Coverage      98%    98%            
======================================
  Files          59     60     +1     
  Lines        8547   8860   +313     
======================================
+ Hits         8448   8761   +313     
  Misses         99     99