Add README with installation instructions

README.md

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+Get current fioul price from Bretagne Multi Énergie and store it. Also with an
+incredible web interface to list price history.
+
+# Requirements
+
+This project is written in Python and uses the following libraries:
+
+* requests: to retrieve current price using a GraphQL query;
+* peewee: a simple ORM, to store and query the data in a SQL database;
+* bottle: a micro web framework.
+
+Those libraries are all packaged in Debian and can be installed with:
+
+```
+apt install python3-request python3-peewee python3-bottle
+```
+
+Optional: a MySQL server (although switching to another database should be
+easy). Otherwise, a SQLite backend can be used.
+
+
+# Installation
+
+We suppose the repository is cloned under `/opt/fioul`.
+
+Create a `fioul.ini` config file, and fill in MySQL credentials. You can use
+`fioul.ini.example` as a starting point. MySQL database can be created with the
+following commands:
+
+```sql
+create database fiouldb;
+create user 'fioul'@'localhost' identified by 'fioul_is_beautifioul';
+grant all privileges on fiouldb.* TO 'fioul'@'localhost';
+```
+
+Tables can be created by running `./fioul.py initdb`
+
+
+To update the database every 15 minutes, the following line can be
+installed as a cronjob:
+
+```
+*/15 * * * * /opt/fioul/fioul.py update
+```
+
+To launch the server automatically, you can install and use the systemd
+service file :
+
+```
+adduser --system --group --no-create-home fioul
+ln -s /opt/fioul/fioul.service /etc/systemd/system/fioul.service
+systemctl enable fioul.service
+systemctl start fioul.service
+```
+
+The server listens to port 9980 on localhost by default, unless
+otherwise specified in the config file. Setting up a reverse proxy and
+ssl is left as an exercise to the reader.