Added Drone build config

.drone.yml

@@ -0,0 +1,11 @@
+kind: pipeline
+name: default
+
+steps:
+- name: build
+  image: python2
+  commands:
+  - apt-get -y update && apt-get -y install git python-pip cloc && pip install platformio
+  - pio run
+  - cloc --by-file --xml --out=.test/cloc.xml src include
+  - make otaupload