chore: create .editorconfig (#2229) [ci skip]

Alex-Sokolov · haoqunjiang · commit 8582a083f6dc · 2018-09-05T14:20:34.000+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
