Docs: Add Documentation for using dagger to Build and Test.

[bupd]

The documentation should be clear, beginner-friendly, and include code snippets to demonstrate Dagger usage for common tasks like building and running tests. This will be helpful for both new and experienced developers who want to automate their CI/CD pipelines using Dagger.

Expected Outcome

Developers should be able to follow the guide to set up Dagger for building and testing the project without any issues.