Add vimwiki.

lua/plugins/vimwiki.lua

@@ -0,0 +1,20 @@
+return {
+  "vimwiki/vimwiki",
+  event = "BufEnter *.md",
+  keys = { "<leader>ww", "<leader>wt" },
+  init = function()
+    vim.g.vimwiki_folding = ""
+    vim.g.vimwiki_list = {
+      {
+        path = "~/notes",
+        syntax = "markdown",
+        ext = ".md",
+      },
+    }
+    vim.g.vimwiki_ext2syntax = {
+      [".md"] = "markdown",
+      [".markdown"] = "markdown",
+      [".mdown"] = "markdown",
+    }
+  end,
+}