Add scalafmt

[taig]

Blocked by

• scalafmtOnCompile doesn't work for additional confifgurations lucidsoftware/neo-sbt-scalafmt#18
• Shared files in cross-building setup are not reformated lucidsoftware/neo-sbt-scalafmt#59

[codecov-io]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files           7        7           
  Lines          46       46           
  Branches        4        3    -1     
=======================================
  Hits           44       44           
  Misses          2        2

Impacted Files	Coverage Δ
...n/scala/io/taig/lokal/LocalizationIdentifier.scala
...ared/src/main/scala/io/taig/lokal/Identifier.scala	100% <0%> (ø)

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