Add Docker support for the Monolith backend

.dockerignore

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+.dockerignore
+.env
+.git
+.gitignore
+.vs
+.vscode
+docker-compose.yml
+docker-compose.*.yml
+*/bin
+*/obj

Backend/Monolithic/Dockerfile

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+#######################################################
+# Step 1: Build the application in a container        #
+#######################################################
+
+# Download the official ASP.NET Core SDK image 
+# to build the project while creating the docker image
+FROM microsoft/dotnet:2.1-sdk-alpine as build
+WORKDIR /app
+
+# Restore NuGet packages
+COPY *.csproj .
+RUN dotnet restore
+
+# Copy the rest of the files over
+COPY . .
+
+# Build the application
+RUN dotnet publish --output /out/ --configuration Release
+
+#######################################################
+# Step 2: Run the build outcome in a container        #
+#######################################################
+
+# Download the official ASP.NET Core Runtime image
+# to run the compiled application
+FROM microsoft/dotnet:2.1.3-aspnetcore-runtime-alpine
+WORKDIR /app
+
+# Open HTTP and HTTPS ports
+EXPOSE 80
+EXPOSE 443
+
+# Copy the build output from the SDK image
+COPY --from=build /out .
+
+# Start the application
+ENTRYPOINT ["dotnet", "ContosoMaintenance.WebAPI.dll"]