add .dir-locals.el for emacs formatting

.dir-locals.el

@@ -0,0 +1,13 @@
+;;; Directory Local Variables
+;;; See Info node `(emacs) Directory Variables' for more information.
+
+(
+ (c-mode . ((c-basic-offset . 3)
+            (c-file-offsets . ((arglist-intro . ++)
+                               (arglist-cont-nonempty . ++)))
+            (eval . (setq-local c-cleanup-list
+                                (cl-set-difference c-cleanup-list
+                                                   '(brace-else-brace
+                                                     brace-elseif-brace))))))
+ (objc-mode . ((c-basic-offset . 3)))
+ )