[FEATURE] Create taskfile for a sub-folder other than root directory

[ggomezGH]

I'm working with Git in a project with multiple code languages (Git, Arduino, etc.), when trying to create a task file, the extension compaints about not having the [workspacefolder.pde] file.

It would be great to being able to compile and run the code in a folder other than the root directory of the workspace, eg. "[Workspace]\src\Processing\prog_name\prog_name.pde

Up until now I was working with sepparate directories for each code language, but I want to consolidate the project in one single repository and still run code locally with this extension.

[Edit]: As stated in #63 I tried to add the folder of the processing sketch directly to the workspace instead of all the Project folder directly, that works as a workaround. I can still compile and run the code so I can work with that for now