add harpoon plugin

lua/custom/plugins/harpoon.lua

@@ -0,0 +1,21 @@
+local mark = require 'harpoon.mark'
+local ui = require 'harpoon.ui'
+
+vim.keymap.set('n', '<leader>a', mark.add_file, { desc = '[A]dd harpoon mark' })
+vim.keymap.set('n', '<leader>sm', require('telescope').extensions.harpoon.marks, { desc = '[S]earch harpoon [M]' })
+vim.keymap.set('n', '<C-e>', ui.toggle_quick_menu)
+
+vim.keymap.set('n', '<A-h>', function()
+  ui.nav_file(1)
+end)
+vim.keymap.set('n', '<A-j>', function()
+  ui.nav_file(2)
+end)
+vim.keymap.set('n', '<A-k>', function()
+  ui.nav_file(3)
+end)
+vim.keymap.set('n', '<A-l>', function()
+  ui.nav_file(4)
+end)
+
+return {}