Feat(nvim): add path and buffer

nvim/.config/nvim/lua/plugins/completion.lua

@@ -24,6 +24,8 @@ return  {
             sources = cmp.config.sources({
                 { name = 'nvim_lsp' },
                 { name = 'vsnip' }, -- For vsnip users.
+                { name = 'path' },
+                { name = 'buffer' },
             }, {
                     { name = 'buffer' },
                 })