updating developer guide for CCI contributors

[dhrubo-os]

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

Merging #1049 (81f47a7) into 2.x (8139f8f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x    #1049   +/-   ##
=========================================
  Coverage     82.32%   82.32%           
  Complexity     1920     1920           
=========================================
  Files           149      149           
  Lines          7507     7507           
  Branches        750      750           
=========================================
  Hits           6180     6180           
  Misses          987      987           
  Partials        340      340           

Flag	Coverage Δ
ml-commons	82.32% <ø> (ø)

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