Adds drone config for CI

.drone.yml

@@ -0,0 +1,12 @@
+---
+kind: pipeline
+name: default
+
+steps:
+  - name: build
+    image: golang:1.13
+    commands:
+    - go build
+---
+kind: signature
+hmac: c1c39bb111f8d76ae1d24b12a6a82d8357fbc06465504d5eb471ef3eb296f722