docs: add readme file

README.md

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+# backup.sh
+I *think* I got the base of this backup script from
+https://blog.bithive.space/post/automatic-backups-with-restic/ (but I'm not 100%
+sure)
+This is my extension of that script which serves my purposes.  I have added a
+notification wrapper, some error checking (which still could be improved) and
+moved a lot of stuff to the env file so that the base script can be run without
+local changes getting overwitten
+
+# Running it
+Eventually I will probably formalize this documentation a bit better, but the
+quick version is:
+
+1. mkdir /etc/restic
+2. copy the backup.sh to /etc/restic
+3. copy the env to /etc/restic
+4. modify the env to suit your needs
+5. setup the systemd timer stuff
+   1. copy the etc/systemd/system/restic-backup.* files to /etc/systemd/system
+   2. `systemctl daemon-reload`
+   3. `systemctl enable --now restic-backup.timer`
+
+