Improved samples

[stephlocke]

dotnet

• Include a sample app .net app in implementation/
• Ensure the github action works on our commit (or is replicated and working in our .github/)
• Add an Azure DevOps pipeline

Java

• Include a sample app java app in implementation/
• Ensure the github action works on our commit (or is replicated and working in our .github/)
• Add an Azure DevOps pipeline