maven build, system reqs, docker version badge

[h1alexbel]

• docker.io
• docker.io
• uses docker ref
• doc(Run action only on approved pulls #13): if approved
• maven build, reqs

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PR-Codex overview

The focus of this PR is to update the README.md file with new badges and instructions for running a Maven build.

Detailed summary

• Added Docker badge with link to the Docker repository
• Updated build instructions to use Maven instead of Gradle
• Added a note specifying the required versions of Maven and Java

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (7132568) to head (26aaefe).
Report is 3 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #15   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           1       1           
  Lines           4       4           
======================================
  Misses          4       4           

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[h1alexbel]

@rultor merge

[rultor]

@rultor merge

@h1alexbel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@h1alexbel Done! FYI, the full log is here (took me 2min)