[SomeeName]

Updated README to include DotCharter details and clarify seven-string chart creation.

What changed

• Added a short tip under the intro that points to DotCharter for making seven-string charts.
• Expanded "Making seven-string charts" with a DotCharter section: the steps from setting the arrangement to 7 strings to putting the exported *_p.psarc into the dlc folder, and notes on plain packages, the RS7X block, the "Split 7th-string chords" export option, Windows-only playback and 8-string status.
• Kept the existing charting guide, RS7X spec and rs7chart notes under "By hand or with your own tools".
• Mentioned DotCharter in the "Seven-string charts" row of the requirements table.
• Added an FAQ entry: "How do I make my own seven-string charts?".

Why

Until now the README said what a seven-string chart is but not how to make one; rs7chart is not published yet. DotCharter now exports seven-string arrangements in the layout rs7string reads, so new users get a working path from tab or audio to a playable chart.

Checks

• .\build.ps1 passes
• uv run pytest tools\tests -q passes
• sitecheck.py and check_exports.py pass (or say why not)
• Branch is not main
• No Ubisoft keys or game assets in this change
• Docs updated if behaviour or settings changed