dir-locals: add emacs setup

.dir-locals.el

@@ -0,0 +1,7 @@
+((c-mode . ((c-file-style . "linux")
+            (indent-tabs-mode . t)
+            (show-trailing-whitespace . t)
+            (c-basic-offset . 4)
+            (tab-width . 4)
+            ))
+ )