Added instructions for Arduino-CLI and PlatformIO Core installation

[DeeEmm]

I've updated the Wiki and added some instructions to install the Arduino command line interface. This will allow you to set up tasks to compile and upload form within Nova.

Not only does this keep everything within Nova but it also provides compile errors within the sidebar that link to the code, which is also highlighted at the line where the error is. This is really useful and a feature that I requested in the Arduino Pro IDE beta.

You can see the compiler output in the 'Arduino Build' task in the bottom panel. Also note that the errors are displayed in the sidebar as well as highlighted in the editor.

Clicking on the error in the sidebar will take you to the relevant line in the code.

[DeeEmm]

You can Trigger build and upload tasks by creating Nova tasks within the project settings