新增：whichkey插件

layers/plug/whichkey.vim

@@ -0,0 +1,20 @@
+vim9script
+
+const g:which_key_map = {
+    f: {
+        name: 'File',
+        o: ['Poplar', 'open']
+    },
+    v: {
+        name: 'View',
+        f: [":NERDTreeToggle", "nerdtree"]
+    }
+}
+
+tui#core#plug#Regist('liuchengxu/vim-which-key', {
+    config: () => {
+        which_key#register('<Space>', "g:which_key_map")
+        nnoremap <silent> <Space> :WhichKey '<Space>'<CR>
+    }
+})
+