[YUNIKORN-2878] Restore status badge (readme)

[ryankert01]

What is this PR for?

Our status badge is currently 404 because of the previous renaming of files. We can restore it.

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2878

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.97%. Comparing base (9e10746) to head (493088d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #969      +/-   ##
==========================================
+ Coverage   80.95%   80.97%   +0.01%     
==========================================
  Files          97       97              
  Lines       12514    12514              
==========================================
+ Hits        10131    10133       +2     
+ Misses       2113     2112       -1     
+ Partials      270      269       -1     

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