Added support for parameter CachingMode

[johlju]

Pull Request (PR) description

• Changes to xSmbShare
  • Added support for parameter CachingMode (issue #8).
    Martin Vokurek (@MartinVokurek)

This PR continues the work that @MartinVokurek started in PR #11. All credit goes to Martin!

This Pull Request (PR) fixes the following issues

• Fixes Feature Request: Caching Settings (Offline Settings) #8
• Closes Add CachingMode parameter #11

Task list

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

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This change is 

[codecov-io]

Codecov Report

Merging #29 into dev will increase coverage by 0.14%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev      #29      +/-   ##
==========================================
+ Coverage   79.71%   79.85%   +0.14%     
==========================================
  Files           1        1              
  Lines         138      139       +1     
  Branches        1        1              
==========================================
+ Hits          110      111       +1     
  Misses         27       27              
  Partials        1        1

Impacted Files	Coverage Δ
DscResources/MSFT_xSmbShare/MSFT_xSmbShare.psm1	79.85% <100%> (+0.14%)	⬆️

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[johlju]

Reviewed 1 of 2 files at r1, 1 of 1 files at r2, 1 of 1 files at r3.
Reviewable status: complete! all files reviewed, all discussions resolved