Added drone pipeline for automagic tests

ref #4

.drone.yml

@@ -1,3 +1,23 @@
+---
+kind: pipeline
+name: tests:node_latest
+clone:
+  disable: true
+steps:
+  - name: checkout pr
+    image: alpine/git
+    commands:
+      - git clone $DRONE_REMOTE_URL .
+      - git checkout $DRONE_SOURCE_BRANCH
+  - name: run tests
+    image: node:latest
+    commands:
+      - yarn
+      - yarn test:ci
+trigger:
+  event:
+    - pull_request
+
 ---
 kind: pipeline
 type: docker