add Terraform

lem-project/lem#1534

content/en/modes/terraform.md

@@ -0,0 +1,20 @@
+---
+title: Terraform
+---
+
+Lem supports Terraform files and editing them with the Terraform Language Server.
+
+>! Terraform support was added on September 20th, 2024.
+
+This is the default LSP configuration:
+
+```lisp
+
+(define-language-spec (terraform-spec lem-terraform-mode:terraform-mode)
+  :language-id "terraform"
+  :root-uri-patterns '()
+  :command (lambda (port) `("terraform-ls" "serve" "-port" ,(princ-to-string port)))
+  :install-command ""
+  :readme-url "https://github.com/hashicorp/terraform-ls"
+  :connection-mode :tcp)
+```