Enhancement: Add File

[localheinz]

This PR

• adds File

[codecov]

Codecov Report

Merging #33 into master will increase coverage by 0.17%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master     #33      +/-   ##
===========================================
+ Coverage     98.42%   98.6%   +0.17%     
- Complexity       45      50       +5     
===========================================
  Files            11      12       +1     
  Lines           127     143      +16     
===========================================
+ Hits            125     141      +16     
  Misses            2       2

Impacted Files	Coverage Δ	Complexity Δ
src/File.php	100% <100%> (ø)	5 <5> (?)

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