Mukesh Sonkar

When I run `nvim leetcode.nvim`, I get this error ``` Error detected while processing VimEnter Autocommands for "*": Error executing lua callback: ....local/share/nvim/lazy/plenary.nvim/lua/plenary/path.lua:511: FileNotFoundError stack traceback: [C]: in function 'error'...

Add all available configuration options in README

1

I know the options are mentioned in [:help gruvbox-material.txt](https://github.com/sainnhe/gruvbox-material/blob/master/doc/gruvbox-material.txt). But it will be really useful if anyone new checks the page, and just being able to copy all available options...