feat: add how to notes.

how-to-notes.md

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+## How-to notes
+
+To complement <https://isso-comments.de/docs/reference/installation/>. But you might be better off reading the original documentation directly. 
+
+The below assumes you have a `git` non-root user.
+
+## As root
+```
+sudo apt install pip3
+pip3 install isso
+
+sudo apt-get install python3-setuptools python3-virtualenv python3-dev
+sudo mkdir /etc/isso
+sudo chown git /etc/isso
+```
+
+## as normal user
+virtualenv /etc/isso
+source /etc/isso/bin/activate
+
+## 
+
+added the following to the config to avoid conflicting with a different service.
+
+```
+[server]
+listen = http://localhost:8081
+```
+
+## Guinicorn
+
+iso-start.sh:
+
+```
+#!/bin/bash
+# taken from <https://blog.phusion.nl/2018/08/16/isso-simple-self-hosted-commenting-system/>
+
+set -e
+cd /etc/isso
+source /etc/isso/bin/activate
+## export LANG=C.UTF-8
+export ISSO_SETTINGS="/etc/isso/isso.cfg"
+## exec gunicorn -n gunicorn-isso -b 127.0.0.1:1927 --preload -w 4 --log-file /var/log/isso/isso.log isso.dispatch 2>>/var/log/isso/isso.log
+gunicorn -b localhost:8081 --preload -w 4 --log-file /etc/isso/isso.log isso.run 2>> /etc/isso/isso.log ## known to work
+```
+
+```
+
+[Unit]
+Description=isso commenting system
+After=system.slice multi-user.target postgresql.service
+
+[Service]
+ExecStart=/etc/isso/isso-start.sh
+
+Restart=on-failure
+TimeoutSec=1
+User=git
+
+LimitNOFILE=16384
+LimitNPROC=16384
+LimitLOCKS=16384
+
+# ensures that the service process and all its children can never gain new
+# privileges.
+NoNewPrivileges=true
+
+[Install]
+WantedBy=multi-user.target
+
+## taken from: <https://blog.phusion.nl/2018/08/16/isso-simple-self-hosted-commenting-system/>
+
+```
+
+^ isso.service
+
+then systemcl daemon-reload
+systemctl enable isso
+systemctl start isso