[Improvement] Add CONTRIBUTING.md (#669)
[Improvement] Add CONTRIBUTING.md (#669)

* [Enhancement] Add CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

aaxelb/SHARE,CenterForOpenScience/SHARE,CenterForOpenScience/SHARE,aaxelb/SHARE,CenterForOpenScience/SHARE,aaxelb/SHARE