Create "What's New?" page for ESLZ (#611)

* create What's New page

* update PR template

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,6 +2,7 @@
 * Associate an issue with the Pull Request.
 * Ensure that the code is up-to-date with the `main` branch.
 * Include a description of the proposed changes. 
+* Update the Wiki "What's New?" page located at `docs/wiki/Whats-new.md`
 -->
 
 **This PR fixes**

docs/wiki/Home.md

@@ -4,6 +4,7 @@ The Enterprise-Scale Landing Zones User Guide aims to provide comprehensive end-
 
 ## Navigation
 
+* [What's New?](./Whats-new)
 * [What is Enterprise-Scale?](./What-is-Enterprise-Scale)
   * [What is Enterprise-Scale reference implementation?](./What-is-Enterprise-Scale#what-is-enterprise-scale-reference-implementation)
   * [Pricing](./What-is-Enterprise-Scale#pricing)

docs/wiki/Whats-new.md

@@ -0,0 +1,33 @@
+## In this Section
+
+- [In this Section](#in-this-section)
+- [Updates](#updates)
+  - [June 2021](#june-2021)
+
+---
+
+Enterprise Scale is updated regularly. This page is where you'll find out about the latest updates to Enterprise Scale for:
+
+- [CAF (Cloud Adoption Framework) Documentation](https://docs.microsoft.com/en-us/azure/cloud-adoption-framework/ready/enterprise-scale/) Updates
+- Improvements to existing guidance and artifacts
+- Azure Policy changes
+- Bug fixes
+- Tooling updates:
+  - [AzOps](https://github.com/azure/azops)
+    - [Releases](https://github.com/Azure/AzOps/releases)
+  - [Terraform Module for Cloud Adoption Framework Enterprise-scale](https://github.com/Azure/terraform-azurerm-caf-enterprise-scale)
+    - [Releases](https://github.com/Azure/terraform-azurerm-caf-enterprise-scale/releases)
+
+> **Note:** Please check the latest release notes for each of the tools, as these will contain more detailed notes relating to changes in each of the tools.
+
+This article will be updated as and when changes are made to the above and anything else of relevance for Enterprise Scale. Make sure to check back here often to keep up with new updates and changes.
+
+> **Important:** Previous changes to the above in relation to Enterprise Scale will not be listed here. However going forward, this page will be updated.
+
+## Updates
+
+Here's what's changed in Enterprise Scale:
+
+### June 2021
+
+- ["What's New?"](./Whats-new) page created

docs/wiki/_Sidebar.md

@@ -1,6 +1,7 @@
 # Wiki content
 
 * [Home](./Home)
+* [What's New?](./Whats-new)
 * [What is Enterprise-Scale](./What-is-Enterprise-Scale)
   * [What is Enterprise-Scale reference implementation?](./What-is-Enterprise-Scale#what-is-enterprise-scale-reference-implementation)
   * [Pricing](./What-is-Enterprise-Scale#pricing)