docs(snap): Move usage instructions to docs

[MonicaisHer]

Usage instructions are being moved to docs; see edgexfoundry/edgex-docs#751.
The snap/README has been updated to include development docs only.

Depends on:

• feat: Extend snap getting started docs edgex-docs#751

Signed-off-by: Mengyi [email protected]

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/device-modbus-go/blob/main/.github/Contributing.md

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)

Testing Instructions

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

Merging #342 (1f3c8e5) into main (0336c9d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #342   +/-   ##
=======================================
  Coverage   41.16%   41.16%           
=======================================
  Files           6        6           
  Lines         566      566           
=======================================
  Hits          233      233           
  Misses        293      293           
  Partials       40       40           

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[farshidtz]

LGTM