Add labels to PR automatically

Author: ElliottKasoar

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,5 @@
 Please click the `Preview` tab and select a PR template:
 
-- [New benchmark](?expand=1&template=new_benchmark.md)
-- [New model](?expand=1&template=new_model.md)
+- [New benchmark](?expand=1&template=new_benchmark.md&labels=new+benchmark)
+- [New model](?expand=1&template=new_model.md&labels=new+model)
 - [All other proposed changes](?expand=1&template=custom.md)