Respect project .clang-format formatter config

[Cloud0310]

current config has builtin format style, of which the priority is higher then project default .clang-format config.
Which is not wanted when the project has its opion on formatting, I suggest to check if current dir has a config. When there isn't a config file, fallback to using default config from nvimdots.

[Cloud0310]

local project_root = vim.fs.root(vim.fn.getcwd(), { ".git" }) or vim.fn.getcwd()

--[[ check if ".clang-format" config exists, if it does, use the config instead of default ]]
if not vim.uv.fs_stat(vim.fs.joinpath(project_root, ".clang-format")) then
	return { "-style={ BasedOnStyle: LLVM, IndentWidth: 4 }" }
end
return {}

the config would be like this.