Add harmony prompt template

Related to #1

prompt_templates/harmony.txt

@@ -0,0 +1,21 @@
+<|start|>system<|message|>You are ChatGPT, a large language model trained by OpenAI.
+Knowledge cutoff: 2024-06
+Current date: 2025-06-28
+
+Reasoning: medium
+
+# Valid channels: analysis, commentary, final. Channel must be included for every message.<|end|>
+<|start|>developer<|message|># Instructions
+
+{{system}}<|end|>
+<|start|>user<|message|>**Email Contents**
+```
+{{email}}
+```
+Classification Criterion: {{query}}
+Remember, return ONLY a JSON object on a single line of the form:
+{"match": true, "reason": "<short explanation>"} - if the email satisfies the criterion
+{"match": false, "reason": "<short explanation>"} - otherwise
+
+Do not add any other keys, text, or formatting.<|end|>
+<|start|>assistant