Generate silence in new project is not impossible

The `__init__.py` file has an incorrect comment:

```
# TODO - Bring up to the Audacity team that there's no way for the macros to just move the cursor to a timestamp in the project because there's no menu item for this. But there's literally no way to start a new project and create, like, a 1-second silence.
```

To create a 1-second silence in a new project:

1. `NewMonoTrack:` or `NewStereoTrack:`
2. `SelectTime: Start=0 End=1`
3. `Silence:`

More generally, use `SelectTime` to move the cursor position.

Open __init__.py and locate the TODO comment about creating silence in a new project. Confirm the documented macro sequence—NewMonoTrack: or NewStereoTrack:, SelectTime: Start=0 End=1, then Silence:—and update the comment to explain that SelectTime can move the cursor position. Done means the comment no longer claims this is impossible.

Written by the indexing model from the issue text.