Added e2e nuget example for Azure DevOps

[matthewalltop]

Added a working example for using Dependabot CLI with Azure Devops Pipelines.

• Config file for nuget.
• Azure Pipelines yaml
• create-pull-requests.sh script - adapted from create.sh in this repo.

Feel free to propose changes or adjust directly!

[brettfo]

Hi @matthewalltop, this PR just came across my radar. As I understand it, the example pipeline will download and run the CLI, publish the result file as an artifact, and a separate stage will extract the result contents and create a PR? If so, I only have once piece of feedback around detecting if the content is base64 encoded. The script checks for only base64-encoded characters and verifies the length, but each item under updated-dependency-files might have a content-encoding property. If this is missing it's assumed to be utf-8 but if it's explicitly base64 then you can trust that. It might make the detection a little cleaner, but ultimately I don't have strong feelings either way.