workflow: add .editorconfig (vuejs#719)

Alex-Sokolov · ulivz · commit b2bad790c999 · 2018-08-12T03:00:57.000+08:00
diff --git a/.editorconfig b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
