add link to community repo

[cicoyle]

Per this issue, I wanted to add the link to the dapr/community roles from within the Java SDK so that new and existing community contributors/approvers/maintainers know what is expected of them as they progress in membership

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.54%. Comparing base (d759c53) to head (a5c5bc8).
Report is 121 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1287      +/-   ##
============================================
- Coverage     76.91%   75.54%   -1.38%     
- Complexity     1592     1616      +24     
============================================
  Files           145      193      +48     
  Lines          4843     5099     +256     
  Branches        562      553       -9     
============================================
+ Hits           3725     3852     +127     
- Misses          821      933     +112     
- Partials        297      314      +17     

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