Added readme

README.md

@@ -0,0 +1,13 @@
+This mod simply looks for a file periodically, which must be created by 
+`touch(1)` or something similar, and owned by the same user who is 
+running the Minetest server.  This file simply serves as a sort of flag.
+
+If found, the file is immediately deleted, and pop-up warnings are 
+issued to all players on the server that it will be rebooting soon.
+
+This mod must be listed in secure.trusted_mods (assuming mod security is 
+enabled) in order for the `os.remove()` function to work.
+
+The pop-up function is provided by kaeza's notice mod, from here:
+
+https://github.com/kaeza/minetest-kaeza_misc