Add projekt0n/github-nvim-theme (#151)

Co-authored-by: Thomas Versteeg <thomas@versteeg.email>

README.md

@@ -264,6 +264,7 @@ Treesitter is a new system coming in Neovim 0.5 that incrementally parses your c
 - [yashguptaz/calvera-dark.nvim](https://github.com/yashguptaz/calvera-dark.nvim) - A port of [VSCode Calvara Dark](https://github.com/saurabhdaware/vscode-calvera-dark) Theme to Neovim with TreeSitter and many other plugins support.  
 - [nxvu699134/vn-night.nvim](https://github.com/nxvu699134/vn-night.nvim) - A dark neovim colorscheme written in lua. Support built-in LSP and Treesitter.
 - [adisen99/codeschool.nvim](https://github.com/adisen99/codeschool.nvim) - Codeschool colorscheme for neovim written in lua with treesitter and built-in lsp support.
+- [projekt0n/github-nvim-theme](https://github.com/projekt0n/github-nvim-theme) - A GitHub theme for neovim, kitty, alacritty written in lua. Support built-in LSP and TreeSitter.
 
 ### Utility