Add .dir-locals.el

Read more here: https://www.gnu.org/software/emacs/manual/html_node/emacs/Directory-Variables.html

Global/Emacs.gitignore

@@ -39,4 +39,7 @@ flycheck_*.el
 /server/
 
 # projectiles files
-.projectile
+.projectile
+
+# directory configuration
+.dir-locals.el