add custom plugins

lua/custom/plugins/init.lua

@@ -2,4 +2,20 @@
 --  I promise not to create any merge conflicts in this directory :)
 --
 -- See the kickstart.nvim README for more information
-return {}
+return {
+  "nvim-treesitter/playground",
+  "nvim-treesitter/nvim-treesitter-context",
+  "theprimeagen/harpoon",
+  "mbbill/undotree",
+  "windwp/nvim-autopairs",
+  "RRethy/vim-illuminate",
+  "ahmedkhalf/project.nvim",
+  "famiu/bufdelete.nvim",
+
+  {
+    "folke/trouble.nvim",
+    dependencies = {
+      "nvim-tree/nvim-web-devicons",
+    },
+  }
+}