Add folding for rust and ruby

vimrc

@@ -13,6 +13,7 @@ set expandtab
 set exrc
 set fillchars=vert:▐
 set foldlevelstart=1
+set foldmethod=manual
 set hidden
 set history=50
 set incsearch
@@ -116,6 +117,16 @@ if filereadable(expand("~/.config/nvim/markdown.vimrc"))
   source ~/.config/nvim/markdown.vimrc
 endif
 
+" Ruby setup
+if filereadable(expand("~/.config/nvim/ruby.vimrc"))
+  source ~/.config/nvim/ruby.vimrc
+endif
+
+" Rust setup
+if filereadable(expand("~/.config/nvim/rust.vimrc"))
+  source ~/.config/nvim/rust.vimrc
+endif
+
 " Color setup
 if filereadable(expand("~/.config/nvim/colors.vimrc"))
   source ~/.config/nvim/colors.vimrc