Add Shader Downloader

[Joelmatho]

The official ReShade installer includes a built-in downloader for shader repositories.

Please consider adding a similar feature.

Thank you for this tool.

[Jobus0]

Since the main goal of ReShade Deployer is to re-use a single local collection of shaders across all games, I haven't focused on a downloader yet. For now, the workflow assumes the user already has their shaders ready.

However, it would definitely be a great convenience feature to have, so I’ll keep this issue open as a potential future enhancement.

Thanks for the feedback!