Add codeowners, issue template and pr template

[evansiroky]

Checklist

• Appropriate branch selected (all PRs must first be merged to dev before they can be merged to master)
• Referenced all applicable issues this PR seeks to resolve
• All tests and CI builds passing

Description

This PR adds codeowners, an issue template and a PR tempalte in order to resolve #410.

[codecov-io]

Codecov Report

Merging #411 into dev will decrease coverage by 0.13%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             dev    #411      +/-   ##
========================================
- Coverage    5.3%   5.17%   -0.14%     
========================================
  Files        322     323       +1     
  Lines      15456   15996     +540     
  Branches    4655    4953     +298     
========================================
+ Hits         820     827       +7     
- Misses     12495   12871     +376     
- Partials    2141    2298     +157

Impacted Files	Coverage Δ
lib/manager/actions/status.js	13.6% <0%> (-4.1%)	⬇️
lib/gtfs/util/graphql.js	33.8% <0%> (-1.5%)	⬇️
lib/gtfs/util/index.js	4.05% <0%> (-0.27%)	⬇️
lib/alerts/reducers/alerts.js	11.84% <0%> (-0.16%)	⬇️
lib/alerts/components/ModeSelector.js	0% <0%> (ø)	⬆️
lib/gtfsplus/components/GtfsPlusField.js	0% <0%> (ø)	⬆️
lib/editor/components/EntityList.js	0% <0%> (ø)	⬆️
lib/public/components/PublicHeader.js	0% <0%> (ø)	⬆️
lib/gtfs/components/gtfs-search.js	0% <0%> (ø)	⬆️
lib/gtfs/components/GtfsMap.js	0% <0%> (ø)	⬆️
... and 20 more

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[abyrd]

Nice templates, including the explanatory text at the beginning of the issue template. We should use templates like this in all our projects. I might borrow some of the language to update the OTP templates as well.

[landonreed]

I'll just reiterate my previous comment from somewhere else (datatools-server or gtfs-lib) that we may not want to require that a PR to master necessarily improve code coverage.

[evansiroky]

I changed the wording for code coverage. Acceptable?

[landonreed]

Thanks, @evansiroky. I like the spirit of that wording change.

[landonreed]

🎉 This PR is included in version 4.1.0 🎉

The release is available on GitHub release

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