Add editor config

Author: nhatthm

.editorconfig

@@ -0,0 +1,16 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+insert_final_newline = true
+max_line_length = 160
+tab_width = 4
+trim_trailing_whitespace = true
+
+[Makefile]
+indent_style = space
+
+[*.feature]
+indent_style = space