feat: CODEOWNERS file

[c-dilks]

A CODEOWNERS file provides the following:

• connects contributors to files they worked on
• notifies contributors of proposed changes to their files, by automatically requesting them for PR review

TODO

• generate a CODEOWNERS file
• replace real names with GitHub handles
• consider automating its update, e.g, with version-bump.sh let's not.. at least the "default" owners (of *) will be notified for new files

[whit2333]

FWIW, you might already be aware of this useful git command. It might make sense to not bother the likes of me if I have 1 commit out of many:

$ git shortlog -n -s -e --  common-tools/clas-detector/src/main/java/org/jlab/detector/decode/CLASDecoder4.java
    28  Nathan Baltzell <[email protected]>
     9  Raffaella De Vita <[email protected]>
     8  Gagik Gavalian <[email protected]>
     2  Nathan Baltzell <[email protected]>
     1  Veronique Ziegler <[email protected]>
     1  Whitney Armstrong <[email protected]>

Set the threshold to say 10% to not bother infrequent contributors:

commit_threshold=$(echo " $(git shortlog -n -s -e --  common-tools/clas-detector/src/main/java/org/jlab/detector/decode/CLASDecoder4.java | cut -f 1 | paste -s -d+ - | bc ) * 0.1 " | bc)
git shortlog -n -s -e --  common-tools/clas-detector/src/main/java/org/jlab/detector/decode/CLASDecoder4.java  |  awk '$1>'${commit_threshold}' {print $0}'
    28  Nathan Baltzell <[email protected]>
     9  Raffaella De Vita <[email protected]>
     8  Gagik Gavalian <[email protected]>