add template for responding to PR comments

llm/comment-diff-request.tmpl

@@ -0,0 +1,32 @@
+File:
+  - name: {{ .Path }}:
+    contents:
+    ```
+{{ .Contents }}
+    ```
+
+Diff:
+{{ .Diff }}
+
+Comment:
+{{ .Comment }}
+
+The above is information about a comment left on a file. The diff contains information about the precise location of the comment.
+
+First, determine if the comment is a question or a request for changes.
+If the comment is a question, come up with an answer, and respond exactly as outlined in "Response Template A"
+If the comment is a request, modify the file provided at the beginning of the message, and respond exactly as outlined in "Response Template B".
+
+Response Template A:
+Q
+[your answer]
+
+Response Template B:
+R
+Files:
+  - name: {{ .Path }}
+    contents:
+    [new {{ .Path }} contents]
+
+Response:
+[additional context about your changes]