builder.AddProject(name, projectPath) overload

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

_No response_

### Describe the solution you'd like

Instead of having to specify the csproj, we should have an overload that looks in a directory for one - if there are multiple it can throw and tell you to use the specific overload with t he filename. This is how we do it for node and python ie
`builder.AddNpmApp("app", "../pathToCode")`

so dotnet proj would look like
`builderAddProject("app", "../PathToCode.Folder")`
instead of
`builderAddProject("app", "../PathToCode.Folder/PathToCode.Folder.csproj")`

### Additional context

_No response_