Add drone ci

.drone.yml

@@ -0,0 +1,13 @@
+kind: pipeline
+type: docker
+name: ci
+steps:
+  - name: submodules
+    image: d.ctdn.net/alpine/git
+    commands:
+        - git submodule update --init --recursive
+  - name: test
+    image: d.ctdn.net/cubetiq/openjdk:11u-ubuntu
+    commands:
+      - apt-get update && apt-get install git -y
+      - sh gradlew bootJar