Add CI file.

.drone.yml

@@ -0,0 +1,15 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: build and test
+    pull: never
+    image: erki/cpp-ubuntu:latest
+    commands:
+      - mkdir -p build
+      - cd build
+      - conan install .. --build=missing
+      - cmake .. -G "Ninja" -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=ON
+      - ninja
+      - ctest . --output-on-failure