feat(plugin): scretch (#34)

i found this plugin on
[reddit](https://www.reddit.com/r/neovim/comments/1346sl5/plugin_scretch_easily_manage_scratch_files/?utm_source=share&utm_medium=web2x&context=3)
and thought it looked useful.

however, i couldn't use it as it depended on telescope, which i just
migrated away from

fixed in [#3](0xJohnnyboy/scretch.nvim#3)

lua/plugins/scretch.lua

@@ -0,0 +1,16 @@
+local M = { "Sonicfury/scretch.nvim" }
+
+M.dependencies = { "ibhagwan/fzf-lua" }
+
+M.opts = { backend = "fzf-lua", scretch_dir = vim.fn.stdpath("cache") .. "/scretch/" }
+
+M.keys = {
+	{ "<leader>sn", function() require("scretch").new() end, desc = "[N]ew [s]cretch" },
+	{ "<leader>snn", function() require("scretch").new_named() end, desc = "[N]ew [s]cretch [n]amed" },
+	{ "<leader>sl", function() require("scretch").last() end, desc = "[L]ast [s]cretch" },
+	{ "<leader>ss", function() require("scretch").search() end, desc = "[S]cretch [S]earch" },
+	{ "<leader>sg", function() require("scretch").grep() end, desc = "[G]rep [S]cretch" },
+	{ "<leader>sv", function() require("scretch").explore() end, desc = "Open [S]cretch dir in file Explorer" },
+}
+
+return M