Started on DS18B20 and PMS5003

Didn't realise DS18B20 was 1-Wire

Will probably just find a library for that one - can't be arsed
doing more bit banging

components/pms5003/pms5003.h

@@ -0,0 +1,5 @@
+#pragma once
+
+typedef enum { PMS5003_OK } pms5003_err;
+
+pms5003_err pms5003_read(void);