Added onFileDrop() event to documentation

[joshterrill]

In case anyone wants to use the onFileDrop event to handle the files in their own way, I've added it to the documentation. I ran into a situation where I wanted to add some custom logic around file uploading, so I added onFileDrop() to my element in order to grab the list of files.

[adrianfaciu]

Thanks for this contribution. We're working to get this into a better shape. If you have any other contributions they will be welcomed 😉

[codecov]

Codecov Report

Merging #857 into development will increase coverage by 3.24%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #857      +/-   ##
===============================================
+ Coverage        32.22%   35.47%   +3.24%     
===============================================
  Files               10       10              
  Lines              540      530      -10     
  Branches            70       74       +4     
===============================================
+ Hits               174      188      +14     
+ Misses             363      325      -38     
- Partials             3       17      +14

Impacted Files	Coverage Δ
scripts/matchers.ts	33.33% <0%> (-9.53%)	⬇️
src/file-upload/file-like-object.class.ts	23.52% <0%> (-8.05%)	⬇️
src/file-upload/file-item.class.ts	21.42% <0%> (-0.8%)	⬇️
src/file-upload/file-uploader.class.ts	25% <0%> (-0.19%)	⬇️
src/file-upload/file-drop.directive.ts	61.22% <0%> (+28.57%)	⬆️
src/file-upload/file-select.directive.ts	80% <0%> (+30%)	⬆️

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