add lazygit plugin

lua/custom/plugins/init.lua

@@ -2,4 +2,10 @@
 --  I promise not to create any merge conflicts in this directory :)
 --
 -- See the kickstart.nvim README for more information
-return {}
+return {
+	"kdheepak/lazygit.nvim",
+	-- optional for floating window border decoration
+	dependencies = {
+		"nvim-lua/plenary.nvim",
+	},
+}