Use correct indent for *.json files

[PhilippKuhlmay]

Suggestion

While edition the composer.json file I realized, that my IDE tried to use a different indent for the lines.
The used indents are 2 spaces for each time I press the tab-key. But my IDE tried to use a tab-stop each time.

Changing following inside the .editorconfig file worked.

# JSON-Files
[*.json]
indent_style = space
indent_size = 2

This is not a bug or something which isn't working. It is only a suggestion for making future developments and code changes much more normalized.

Keep in mind that this change will also change the indents inside the file Build/package.json as there are used tab-stops instead of spaces.

I can provide a new PR tomorrow, if wished.

[PhilippKuhlmay]

I cannot remove the label "bug" from this Issue. Bug is not correct.