Added cheatsheed.nvim usage

lua/custom/plugins/cheatsheet.lua

@@ -0,0 +1,13 @@
+return {
+  'sudormrfbin/cheatsheet.nvim',
+
+  requires = {
+    { 'nvim-telescope/telescope.nvim' },
+    { 'nvim-lua/popup.nvim' },
+    { 'nvim-lua/plenary.nvim' },
+  },
+  config = function()
+    require('cheatsheet').setup()
+  end,
+  vim.keymap.set('n', '<leader>sc', ':Cheatsheet<CR>', { desc = '[S]earch in [C]eatsheet' }),
+}