add old files

nvim/lua/plugins/harpoon.lua

@@ -0,0 +1,23 @@
+return {
+    'ThePrimeagen/harpoon',
+    config = function(_, opts)
+        require('harpoon').setup(opts)
+        local mark = require('harpoon'.. ".mark")
+        local ui = require('harpoon'.. ".ui")
+
+        -- Harpoon marked files 1 through 4.
+        vim.keymap.set("n", "<a-1>", function() ui.nav_file(1) end)
+        vim.keymap.set("n", "<a-2>", function() ui.nav_file(2) end)
+        vim.keymap.set("n", "<a-3>", function() ui.nav_file(3) end)
+        vim.keymap.set("n", "<a-4>", function() ui.nav_file(4) end)
+
+        -- Harpoon next and previous.
+        vim.keymap.set("n", "<a-n>", function() ui.nav_next() end)
+        vim.keymap.set("n", "<a-p>", function() ui.nav_prev() end)
+
+        -- Harpoon user interface.
+        vim.keymap.set("n", "<leader>hq", ui.toggle_quick_menu)
+        vim.keymap.set("n", "<leader>ha", mark.add_file)
+
+    end
+}