Created a short page on how to create a systemd unit for uWSGI

Run-uWSGI-at-boot.md

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+Having to run uWSGI manually is annoying and not maintainable.
+Instead, you should have `systemd` automatically start it at boot for you.
+
+We can have `systemd` handle lauching uWSGI by creating a unit file for it.
+Create a new file called `etesync_server.service` and paste in the following.
+Don't forget to set the correct path to your installation.
+If you don't use a `.ini` file, pass flags here to your uWSGI.
+
+```
+[Unit]
+Description=Execute the etesync server.
+
+[Service]
+ExecStart=/usr/local/bin/uwsgi --ini /path/to/server-skeleton/uwsgi.ini
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Next, copy this to `/etc/systemd/system`.
+`systemd` should now be able to start it.
+By also enabling it, it will launch at boot.
+
+```
+cp etesync_server.service /etc/systemd/system
+sudo systemd start etesync_server
+sudo systemd enable etesync_server
+```
+
+Check to see if it worked!
+If it didn't work, use the command `sudo systemd status etesync_server` to see what went wrong.