examples/http: Add a better example for creating a File over HTTP

[adamdecaf]

Issue: #380

[codecov-io]

Codecov Report

Merging #390 into master will decrease coverage by 0.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #390      +/-   ##
==========================================
- Coverage   85.41%   84.94%   -0.48%     
==========================================
  Files         107      107              
  Lines        6774     8793    +2019     
==========================================
+ Hits         5786     7469    +1683     
- Misses        712     1048     +336     
  Partials      276      276

Impacted Files	Coverage Δ
test/ach-adv-read/main.go	55.55% <0%> (-8.09%)	⬇️
test/ach-axt-read/main.go	57.14% <0%> (-8.08%)	⬇️
test/ach-ccd-read/main.go	57.14% <0%> (-8.08%)	⬇️
test/ach-iat-read/main.go	60% <0%> (-8%)	⬇️
test/ach-trc-read/main.go	47.82% <0%> (-7.73%)	⬇️
test/ach-trx-read/main.go	47.82% <0%> (-7.73%)	⬇️
test/ach-xck-read/main.go	47.82% <0%> (-7.73%)	⬇️
test/ach-web-read/main.go	65.71% <0%> (-7.62%)	⬇️
test/ach-shr-read/main.go	45.45% <0%> (-7.49%)	⬇️
test/ach-pop-read/main.go	45.45% <0%> (-7.49%)	⬇️
... and 93 more

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