Added instruction commands for setting up uWSGI

Author: Benjamin

section9/lectures/140_setting_up_uWSGI_to_run_our_REST_API/commands.md

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+## Setting up uWSGI
+This guide will help you set up uWSGI on your server to run the items rest app. Go to the items-rest directory we created in the previous lecture.
+
+```bash
+cd /var/www/html/items-rest
+```
+
+### Create Ubuntu service
+Run the following command to create a service file.
+
+```bash
+sudo vi /etc/systemd/system/uwsgi_items_rest.service 
+```
+
+Copy and paste the following to the file. Note "jose:1234" is the username:password combination of the Postgres user we created before. Change yours accordingly. 
+
+```bash
+[Unit]
+Description=uWSGI items rest
+
+[Service]
+Environment=DATABASE_URL=postgres://jose:1234@localhost:5432/jose
+ExecStart=/var/www/html/items-rest/venv/bin/uwsgi --master --emperor /var/www/html/items-rest/uwsgi.ini --die-on-term --uid jose --gid jose --logto /var/www/html/items-rest/log/emperor.log
+Restart=always
+KillSignal=SIGQUIT
+Type=notify
+NotifyAccess=all
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Replace the uwsgi.ini file contents with the following
+
+```bash
+[uwsgi]
+base = /var/www/html/items-rest
+app = run
+module = %(app)
+
+home = %(base)/venv
+pythonpath = %(base)
+
+socket = %(base)/socket.sock
+
+chmod-socket = 777
+
+processes = 8
+
+threads = 8
+
+harakiri = 15
+
+callable = app
+
+logto = /var/www/html/items-rest/log/%n.log
+```
+
+Finally start the app by running
+
+```bash
+sudo systemctl start uwsgi_items_rest
+```