Add hcl extention for nomad files

to get syntax highlighting be default.

2-nomad-config/webapp.nomad.hcl

@@ -0,0 +1,41 @@
+job "demo-webapp" {
+  group "demo" {
+    count = 3
+
+    network {
+      port "http"{
+        to = -1
+      }
+    }
+
+    service {
+      name = "demo-webapp"
+      port = "http"
+
+      tags = [
+        "traefik.enable=true",
+      ]
+
+      check {
+        type     = "http"
+        path     = "/"
+        interval = "2s"
+        timeout  = "2s"
+      }
+    }
+
+    task "server" {
+      env {
+        PORT    = "${NOMAD_PORT_http}"
+        NODE_IP = "${NOMAD_IP_http}"
+      }
+
+      driver = "docker"
+
+      config {
+        image = "hashicorp/demo-webapp-lb-guide"
+        ports = ["http"]
+      }
+    }
+  }
+}