WIP: Implements first api calls

[WTFKr0]

Closes #3

• User register - error on already exists
• User register - send mail and create user in db, with a validation token
• Validate account - error on bad validation code
• Validate account - info on account already validated
• Validate account - set validation code to validated if ok
• Auth - error on bad credentials
• Auth - info if account not validated
• Auth - success on good credentials
• Auth - send JWT token on success
• Send data

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@4079b90). Click here to learn what that means.
The diff coverage is 7.74%.

@@           Coverage Diff            @@
##             master      #4   +/-   ##
========================================
  Coverage          ?   8.38%           
========================================
  Files             ?       2           
  Lines             ?     155           
  Branches          ?       0           
========================================
  Hits              ?      13           
  Misses            ?     142           
  Partials          ?       0

Impacted Files	Coverage Δ
api/api.go	1.55% <0%> (ø)
api/utils.go	42.3% <42.3%> (ø)

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