Sprint prep

[b5]

Sprint prep checklist. This PR should: * Update repo to new package names (archive -> core, etc.)

• Add stub README.md, moving old readme to readme_prev.md if it existed
• Add .github stuff: CONTRIBUTING, ISSUES
• Add support for codecov.io to CI tests
• confirm existence of a LICENSE file

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@f143135). Click here to learn what that means. The diff coverage is 0%.

@@            Coverage Diff            @@
##             master      #17   +/-   ##
=========================================
  Coverage          ?   11.35%           
=========================================
  Files             ?       10           
  Lines             ?      493           
  Branches          ?        0           
=========================================
  Hits              ?       56           
  Misses            ?      436           
  Partials          ?        1

Impacted Files	Coverage Δ
errors.go	0% <ø> (ø)
cron.go	0% <0%> (ø)
handlers.go	17.64% <0%> (ø)
server.go	41.5% <0%> (ø)

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[dcwalk]

This PR should address #18 and https://github.com/datatogether/roadmap/issues/53

[b5]

Should we also add codecov badges?

[dcwalk]

@b5 -- your call.

[b5]

@patcon here's a working example, it should switch from "unknown" once we merge to master. is this ready to merge @dcwalk?

[patcon]

Ok, two +1 makes this good to go!