Add a docker compose migration guide

[davidfowl]

We have a lot of people trying to migrate from docker compose to aspire. It would be great to have a guide that explained how some of the concepts translate (or don't translate).

[IEvangelist]

What details can you provide to help write this content. I can work on this Monday, just need to know the gaps that you called attention to.

• Could you maybe link to existing issues that you're seeing (if any)?
• Do we have any examples of docker compose being converted to .NET Aspire?

I just did a search in both dotnet/aspire and dotnet/aspire-samples, and found very few references for:

• compose.yml
• docker-compose.yml

I see discussions https://github.com/dotnet/aspire/discussions/2485, https://github.com/dotnet/aspire/discussions/1735, and https://github.com/dotnet/aspire/discussions/1137.

[davidfowl]

I'll fill out some details.