Attach a letter template to correspondence

## Description:
- Covers templates selected as part of redirects, acknowledgement of request

* As a FOI analyst
* I want editable letter templates
* so that I can send correspondence to applicants that is both comprehensive and customizable

* What are the most critical features being built as part of this Epic
* Expected Outcome – Justification why this Feature must be built, what is expected value and justification for priority.

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**Sizing**

* T-shirt size:

[ ] S
[ ] M
[ ] L
[ ] XL

(S=1-2 Sprints, M=2-3 Sprints, L=4-5 Sprints, XL=not sure, probably more than 5 Sprints).

* *Risks and Assumptions**

1. [ ] What are assumptions?
2. [ ] What are the risks?
3. [ ] Have we done an RFC on a technical approach?
4. [ ] Are the dependencies (technical, business, regulatory/policy) known?
5. [ ] Has work on this Epic been prioritized with key stakeholders?

The issue names no files, tests, or entry points to begin with. First clarify the critical template features, expected value, sizing, risks, assumptions, technical approach, dependencies, and prioritization; it is done when those requirements are defined for editable correspondence templates used in redirects and request acknowledgements.

Written by the indexing model from the issue text.