Add editorconfig

Author: oliversalzburg

.editorconfig

@@ -0,0 +1,15 @@
+# editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+continuation_indent = 4
+
+[package.json]
+indent_style = space
+indent_size = 2