feat: add sad CLI and nvim plugin to find and replace easily

nvim/after/plugin/sad.lua

@@ -0,0 +1,14 @@
+-- sad.nvim – https://github.com/ray-x/sad.nvim
+local status_ok, sad = pcall(require, "sad")
+if not status_ok then
+	return
+end
+
+sad.setup({
+	diff = "delta", -- you can use `diff`, `diff-so-fancy`
+	ls_file = "fd", -- also git ls_file
+	exact = false, -- exact match
+	vsplit = true, -- split sad window the screen vertically, when set to number
+	height_ratio = 0.6, -- height ratio of sad window when split horizontally
+	width_ratio = 0.6, -- height ratio of sad window when split vertically
+})