Document usage with emacs lsp-mode

README.md

@@ -124,7 +124,17 @@ This is LSP(Language Server Protocol) for Terraform
 
 ### Emacs
 
-- Should work with emacs-lsp(need confirmation)
+- Work with [emacs-lsp/lsp-mode](https://github.com/emacs-lsp/lsp-mode) while still a little buggy
+   ```lisp
+   (add-to-list 'lsp-language-id-configuration '(terraform-mode . "terraform"))
+
+   (lsp-register-client
+    (make-lsp-client :new-connection (lsp-stdio-connection '("/path/to/terraform-lsp/terraform-lsp" "-enable-log-file"))
+                     :major-modes '(terraform-mode)
+                     :server-id 'terraform-ls))
+
+   (add-hook 'terraform-mode-hook #'lsp)
+   ```
 
 ### Others