Add Dockerfile

Dockerfile

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+# stage 1 - build the source
+from microsoft/dotnet:2.2-sdk-alpine as builder
+workdir /sln
+copy . .
+run dotnet restore
+run dotnet publish -c Release
+entrypoint bash
+
+
+# stage 2 - run the result
+from microsoft/dotnet:2.2-runtime-alpine
+workdir /app
+copy --from=builder /sln/CSharp.lua.Launcher/bin/Release/netcoreapp2.0/* ./
+entrypoint ["/usr/bin/dotnet", "CSharp.lua.Launcher.dll"]
+cmd ["-s", ".", "-d", "build"]