Add editorconfig properties for c

.editorconfig

@@ -4,8 +4,13 @@ root = true
 indent_style = space
 indent_size = 2
 tab_width = 4
+
 end_of_line = lf
 #charset = utf-8
+
 trim_trailing_whitespace = true
 insert_final_newline = true
 max_line_length = 80
+
+[*.c]
+indent_size = 4