Added example

example.py

@@ -0,0 +1,14 @@
+from smbus2 import SMBus
+from sgp30 import SGP30
+
+if __name__ == "__main__":
+    bus = SMBus(1)
+    sensor = SGP30(bus)
+    print(sensor.read_features())
+    print(sensor.read_serial())
+    sensor.init_sgp()
+    for i in range(300):
+        print(sensor.read_measurements())
+        time.sleep(0.1)
+    sensor.store_baseline()
+    bus.close()