Update readme.md (#3)

This pull request adds a new section to the `readme.md` file to document
the environments used in the project. It includes links to production,
preview, and canary environments and explains the behavior of pull
request environments.

### Documentation updates:

*
[`readme.md`](diffhunk://#diff-5a831ea67cf5cf8703b0de46901ab25bd191f56b320053be9332d9a3b0d01d15R31-R38):
Added a new "Environments" section to document the production, preview,
and canary environments, including their URLs and the behavior of pull
request environments.

Author: MrHinsh

readme.md

@@ -28,6 +28,14 @@ If you are not familiar with or do not want to use `git`, submit a [new issue](h
 
 For contributions beyond `site\data\register.json`, see the [Contributing Guide](.github/CONTRIBUTING.md).
 
+### Environments
+
+- [Production](https://lemon-stone-0045b7f10.6.azurestaticapps.net)
+- [Preview](https://lemon-stone-0045b7f10-preview.centralus.6.azurestaticapps.net/)
+- Canary - There can be 2 canary environments at once that are built from Pull Requests. They are in the form https://lemon-stone-0045b7f10-{PullRequestId}.centralus.6.azurestaticapps.net/
+
+Pull Requests automatically spawn environments. However, PR's from forks require approval to run.
+
 ### Editorial Guidelines
 
 #### Description