Add rest-api example (#889)

examples/rest-api/bruno/ec-rest-api/default_query.bru

@@ -0,0 +1,17 @@
+meta {
+  name: default_query
+  type: http
+  seq: 2
+}
+
+post {
+  url: http://localhost:8000/query
+  body: json
+  auth: none
+}
+
+body:json {
+  {
+    "query": "Who is Elon Musk?"
+  }
+}