Add LSP settings for SCSS, LESS, XML and PHP
LSP settings for these filetypes. Haven't used them extensively but have tested with different files and they have worked.
XML commit contains some installation information that would be useful for users to show somewhere.
For PHP root needs to be defined since it's where it searches and indexes PHP files. I've defined root: "." since if I use:
"rootIndicationFileNames": [".git", "composer.json"]
..it still searches $HOME although project's directory contains either one of those files.