Added Org-mode section to Emacs ignore file

Org-mode stores archived TODOs from todo.org into todo.org_archive. It also
creates .org-id-locations in some cases.

Global/Emacs.gitignore

@@ -6,3 +6,7 @@
 auto-save-list
 tramp
 .\#*
+
+# Org-mode
+.org-id-locations
+*_archive