PdfCraft guides

1. 01How to install PdfCraft on macOS, Windows and LinuxWhich PdfCraft 0.6.0 file to download for your OS and CPU, how to verify it, and how to build PdfCraft from source. Based on the official README and the v0.6.0 release.
2. 02PdfCraft: a free, open-source Adobe Acrobat alternativeWhat PdfCraft 0.6.0 is, what it already does, and where it still falls short of Adobe Acrobat. Based only on the official PdfCraft README and docs.