feat(note2cal): add plugin

lua/custom/plugins/note2cal.lua

@@ -0,0 +1,18 @@
+return {
+  'lfilho/note2cal.nvim',
+  config = function()
+    require('note2cal').setup {
+      debug = false, -- if true, prints a debug message an return early (won't schedule events)
+      calendar_name = 'Calendar', -- the name of the calendar as it appear on Calendar.app
+      highlights = {
+        at_symbol = 'WarningMsg', -- the highlight group for the "@" symbol
+        at_text = 'Number', -- the highlight group for the date-time part
+      },
+      keymaps = {
+        normal = '<Leader>se', -- mnemonic: Schedule Event
+        visual = '<Leader>se', -- mnemonic: Schedule Event
+      },
+    }
+  end,
+  ft = 'markdown',
+}