Add .drone-ci file

Ref #1

Add the configuration file for the CI

.drone.yml

@@ -0,0 +1,17 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+- name: test
+  image: golang
+  commands:
+  - cd tracker
+  - make build
+  - make test
+
+trigger:
+  event:
+    - push
+    - pull_request
+    - tag