Update CONTRIBUTING.md

[siri-varma]

Description

Please explain the changes you've made

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1328

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[siri-varma]

@dapr/approvers-java-sdk @cicoyle @artur-ciocanu @salaboy I updated the contributing.md file. Can you folks please take a look ? Thank you.

[artur-ciocanu]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.42%. Comparing base (d759c53) to head (9cabf8f).
Report is 136 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1327      +/-   ##
============================================
+ Coverage     76.91%   77.42%   +0.50%     
- Complexity     1592     1764     +172     
============================================
  Files           145      204      +59     
  Lines          4843     5368     +525     
  Branches        562      587      +25     
============================================
+ Hits           3725     4156     +431     
- Misses          821      899      +78     
- Partials        297      313      +16     

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