Add global config dir for kit file

Author: drook207

lua/cmake-tools/const.lua

@@ -21,7 +21,7 @@ local const = {
     -- none:      this will make this option ignored
     target = vim.loop.cwd(), -- path to directory, this is used only if action == "soft_link" or action == "copy"
   },
-  cmake_kits_path = nil, -- this is used to specify global cmake kits path, see CMakeKits for detailed usage
+  cmake_kits_path = "~/.config/cmake-tools/", -- this is used to specify global cmake kits path, see CMakeKits for detailed usage
   cmake_variants_message = {
     short = { show = true }, -- whether to show short message
     long = { show = true, max_length = 40 }, -- whether to show long message