Need more icon for some filetypes

[glepnir]

like key file makefile...etc

[kristijanhusak]

I'm not sure what would we put for *.key. Seems like even vim-devicons doesn't have an icon for that.

[glepnir]

@kristijanhusak what about f43d

[kristijanhusak]

@glepnir Yeah that works. I added that and a lot of other icons that are part of vim-devicons.

[glepnir]

It works. Maybe add some syntax color will be more beautiful?

[kristijanhusak]

I used colors from https://github.com/tiagofumo/vim-nerdtree-syntax-highlight, whatever was set.
Feel free to create a PR with colors that you think will fit.