Add Dockerfile and .dockerignore

.dockerignore

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+.github

Dockerfile

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+FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
+WORKDIR /app
+
+RUN mkdir -p src/UnityNuGet && mkdir -p src/UnityNuGet.Server && mkdir -p src/UnityNuGet.Tests
+
+COPY src/*.sln src
+COPY src/UnityNuGet/*.csproj src/UnityNuGet
+COPY src/UnityNuGet.Server/*.csproj src/UnityNuGet.Server
+COPY src/UnityNuGet.Tests/*.csproj src/UnityNuGet.Tests
+RUN dotnet restore src
+
+COPY . ./
+RUN dotnet publish src -c Release -o ../out
+
+# Build runtime image
+FROM mcr.microsoft.com/dotnet/core/aspnet:2.2
+WORKDIR /app
+COPY --from=build /app/src/out .
+ENTRYPOINT ["dotnet", "UnityNuGet.Server.dll"]