added use consultation query

src/sales_backend.cr

@@ -90,6 +90,10 @@ post "/user" do |context|
     "OK".to_json
 end
 
+get "/user" do |context|
+    authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"])).to_json
+end
+
 # Creates a WebSocket handler.
 # Matches "ws://host:port/socket"
 ws "/socket" do |socket|