✨ Add app meta add referrer api

[williamchong]

No description provided.

[codecov]

Codecov Report

Merging #143 into master will increase coverage by 0.69%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
+ Coverage   43.16%   43.86%   +0.69%     
==========================================
  Files          67       68       +1     
  Lines        2759     2788      +29     
==========================================
+ Hits         1191     1223      +32     
+ Misses       1568     1565       -3     

Impacted Files	Coverage Δ
src/routes/app/index.js	96.42% <100.00%> (+5.51%)	⬆️
src/util/ValidationHelper.js	41.17% <100.00%> (ø)
src/util/api/app/index.js	100.00% <100.00%> (ø)
src/util/firebase.js	82.14% <0.00%> (+2.67%)	⬆️

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