chore: Add .editorconfig

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{rb,yml,yaml,jbuilder}]
+charset = utf-8
+indent_style = space
+indent_size = 2