Add a new Guide: Encryption (front-end, middle tier, database)

[j-paquette]

Create a new guide in the docs/_guides folder, using the same format as _template.md

Title: Encryption (front-end, middle tier, database)
Content:

Add front matter to this guide, something like this:

---
title: Encryption (front-end, middle tier, database)
layout: default
category: Development
summary: Add a short description of the guide here.
date: YYYY-MM-DD
---

Add further content here