update named templates

template/testdata/phi-3.gotmpl/system-user-assistant-user

@@ -0,0 +1,9 @@
+<|system|>
+You are a helpful assistant.<|end|>
+<|user|>
+Hello, how are you?<|end|>
+<|assistant|>
+I'm doing great. How can I help you today?<|end|>
+<|user|>
+I'd like to show off how chat templating works!<|end|>
+<|assistant|>