add mapping cheatsheet (#244)

lua/plugins/chadsheet.lua

@@ -0,0 +1,25 @@
+local present, chadsheet = pcall(require, "cheatsheet")
+
+if not present then
+   return
+end
+
+local mappings = require("chadrc").mappings
+
+-- add user mappings to the cheetsheet
+for section, data in pairs(mappings) do
+   for description, keymap in pairs(data) do
+      chadsheet.add_cheat(description, keymap, section)
+   end
+end
+
+require("cheatsheet").setup {
+
+   bundled_cheatsheets = {
+      enabled = { "default" },
+      disabled = { "unicode", "nerd-fonts" },
+   },
+
+   bundled_plugin_cheatsheets = false,
+   include_only_installed_plugins = true,
+}