LightCraft guides

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