feat: added README

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

README.md

@@ -0,0 +1,33 @@
+# Livebox to InfluxDB connector
+
+> A Rust program to send data gathered using the Livebox API to a time series
+> database: InfluxDB.
+
+To use this connector, just launch it using:
+
+```bash
+cargo run --release
+```
+
+## Environment variable
+
+The different environment variables used to configure this program are:
+
+- `INFLUXDB_HOST`: the InfluxDB host
+- `INFLUXDB_ORG`: the InfluxDB organization
+- `INFLUXDB_TOKEN`: the InfluxDB access token
+- `INFLUXDB_BUCKET`: the InfluxDB bucket
+- `ROUTER_PASSWORD`: the password for the `admin` account
+- `HOSTNAME`: used to differentiate one Livebox from another
+- `LOOP_DELAY`: the time to wait between each data collection (default `60`)
+
+## Legal
+
+`Livebox` is a trademark owned by France Telecom and Orange, and is their
+property. This software uses only the name as it is also the name of the internet
+AP lent to Orange customers (at least in France). No intellectual property
+infrigement intended.
+
+If there's any issue with the use of this name here, please don't hesitate to
+contact me at my email address.
+