Update README.md

Author: beacoder

README.md

@@ -59,6 +59,19 @@ Recommended `eglot` configuration:
                       "--malloc-trim")))
 ```
 
+Recommended `tree-sitter` configuration:
+```emacs lisp
+ (when (treesit-available-p)
+   (use-package treesit
+     :ensure t
+     :init (setq treesit-extra-load-path
+                 (gptel-cpp-complete--get-treesit-extra-load-path)
+                 major-mode-remap-alist
+                 '((c-mode          . c-ts-mode)
+                   (c++-mode        . c++-ts-mode))
+                 treesit-font-lock-level 4)))
+```
+
 ---
 
 ## Installation