docs: context stores

[erodewald]

The docs were missing information about context stores which are vital to out-of-band API calls.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document
• My code follows the code style of this project (hint: install an xo editor plugin)
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[codecov]

Codecov Report

Merging #66 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   29.86%   29.86%           
=======================================
  Files          44       44           
  Lines        1661     1661           
  Branches      234      234           
=======================================
  Hits          496      496           
  Misses       1165     1165

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[smartthingspi]

🎉 This PR is included in version 1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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