Rewrite electricity-logger to use an sqlite3 database

docs/ELECTRICITY_LOGGER.md

@@ -0,0 +1,24 @@
+## About
+
+This small tool is meant for logging the electricity values from the `Landis Gyr E350` electricity meter. As a bonus it also stores the gas concumption values.
+
+## Example Usage
+
+```bash
+#!/bin/bash
+
+directoryPath="/var/log/electricity/$(date +%Y/)"
+if ! [ -d "$directoryPath" ]; then
+	mkdir -p "$directoryPath"
+fi
+
+outputFile="$directoryPath$(date +%m_%d.txt)"
+if ! [ -f "$outputFile" ]; then
+	touch "$outputFile"
+fi
+
+datestr="$(date +%Y-%m-%dT%T)"
+electricity-logger -c "$datestr" /dev/ttyUSB0 >> "$outputFile"
+```
+
+Use the `--help` switch for more information about the possible arguments `electricity-logger` can take.