Merge branch 'istaester/add-editorconfig' into 'develop'

Add editorconfig

See merge request !235

.editorconfig

+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+end_of_line = lf
+
+[{*.yaml, *.yml}]
+indent_size = 2