adds database layout as file

docs/database.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS sensor(
+	sensorId INTEGER NOT NULL PRIMARY KEY,
+	resolution REAL NOT NULL,
+	accuracy REAL NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS dataPoint(
+	dataPointId INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+	sensorFK INTEGER NOT NULL,
+	timestamp INTEGER NOT NULL,
+	value REAL NOT NULL,
+	FOREIGN KEY(sensorFK) REFERENCES sensor(sensorId)
+);