Send emails from for on finished.html. Related #70.

[RhodesPeter]

• add form to finished .html
• add NodeMailer as a dependency
• add axios to frontend to make a post request to NodeMailer
• created gmail account for NodeMailer -> welcome.to.cahms@gmail.com
• create emailValidator function

[codecov-io]

Codecov Report

Merging #110 into master will decrease coverage by 11.11%. The diff coverage is 54.54%.

@@             Coverage Diff             @@
##           master     #110       +/-   ##
===========================================
- Coverage     100%   88.88%   -11.12%     
===========================================
  Files           2        3        +1     
  Lines          34       45       +11     
  Branches        2        3        +1     
===========================================
+ Hits           34       40        +6     
- Misses          0        5        +5

Impacted Files	Coverage Δ
src/server.js	100% <100%> (ø)	:arrow_up:
src/send-email.js	50% <50%> (ø)
src/routes.js	95.65% <50%> (-4.35%)	:arrow_down:

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