Add .drone.yml

.drone.yml

@@ -0,0 +1,13 @@
+kind: pipeline
+name: default
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: build-test
+  image: mcr.microsoft.com/dotnet/core/sdk:latest
+  commands:
+  - dotnet restore
+  - dotnet build