feat(pack): add cpp base pack

[doupongzeng]

Hello,

I noticed that there wasn't a package for cpp, so I created one for myself. Perhaps it will be useful to someone else.

[Uzaaft]

Looks good to me.
@doupongzeng Should we perhaps add stuff like: p00f/clangd_extensions.nvim and Civitasv/cmake-tools.nvim?

[mehalter]

I went ahead and added clangd_extensions, cmake-tools.nvim and also standardized the file name

[Uzaaft]

Works like a charm☘️