update readme

README.md

@@ -30,7 +30,7 @@ Among other things these tweaks are included :
 Since this is just a base image, some additional setup is needed.
 The following is just an example of how your Dockerfile could look like.
 
-``
+```sh
 # Password for the certificate
 # this image contains the entire .NET SDK and is ideal for creation the build
 FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine-amd64 AS build-env
@@ -47,7 +47,7 @@ WORKDIR /App
 COPY --from=build-env /App/out .
 # entrypoint for image
 ENTRYPOINT ["dotnet", "test.dll"]
-``
+```
 
 ### Security implications