Add docker implementation

[Nordes]

It's already a work in progress.

1. Add the docker file
2. Push the docker file to the github ( honosoft/badgeit )
3. Make the docker file use a mounted volume for appsettings override
4. Instead of appsettings override, use environment variable (one SonarQube configuration)
5. Show an example with dockercompose (SonarQube + Shields.io)

[Nordes]

Done