Updated Contributing (markdown)
add missing extensions that were already on index, and update stable horde worker instructions
Updated Extensions (markdown)
add Ultimate SD Upscale and Stable Horde Worker as extensions
and entry for stable horde, and add Stable Horde Worker as extension
Updated Command Line Arguments and Settings (markdown)
Updated Developing extensions (markdown)
Updated Optimizations (markdown)
Updated Localization (markdown)
Updated Seed breaking changes (markdown)
Updated Extensions index (markdown)
add README
Updated Features (markdown)
Updated Custom Scripts (markdown)
Add model converter script
Updated Textual Inversion (markdown)
add .ps1 powershell launch scripts