new: Add installation notes

doc/install_notes.md

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+# Requirements
+
+* Ubuntu 20.04.1 (or equivalent) - Update all the things
+
+```bash
+sudo apt update
+sudo apt dist-upgrade
+```
+* Packaged dependencies
+
+```bash
+sudo apt install build-essential
+sudo apt install docker.io
+sudo apt-get install python3-venv python3-dev
+```
+
+* poetry
+
+```bash
+curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python3
+source $HOME/.poetry/env
+```
+
+* redis
+
+```bash
+git clone https://github.com/antirez/redis.git
+cd redis
+git checkout 6.0
+make
+cd ..
+```
+* Splash
+
+```bash
+sudo docker pull scrapinghub/splash:3.5.0
+```
+* lookyloo
+
+```bash
+git clone https://github.com/Lookyloo/lookyloo.git
+cd lookyloo
+poetry install
+echo LOOKYLOO_HOME="'`pwd`'" > .env
+```
+
+# Configure lookyloo
+
+```bash
+cp config/generic.json.sample config/generic.json
+cp config/modules.json.sample config/modules.json
+```
+
+And edit the files acordingly (see comments).
+
+# Start the things
+
+It is recommended to use tmux, and run the two following commands in 2 different shells
+
+```bash
+sudo docker run -p 8050:8050 -p 5023:5023 scrapinghub/splash:3.5.0 --disable-browser-caches
+```
+
+```bash
+poetry run start.py
+```