Readme update with Hastlayer

Readme.md

@@ -16,6 +16,7 @@ We at [Lombiq](https://lombiq.com/) also used this module for the following proj
 - The new client portal for [WTW](https://www.wtwco.com/) ([see case study](https://lombiq.com/blog/lombiq-s-journey-with-wtw-s-client-portal)).
 - The new [Show Orchard website](https://showorchard.com/) when migrating it from Orchard 1 DotNest to DotNest Core ([see case study](https://dotnest.com/blog/show-orchard-case-study-migrating-an-orchard-1-dotnest-site-to-orchard-core)).<!-- #spell-check-ignore-line -->
 - The new [Git-hg Mirror website](https://githgmirror.com/) when migrating it from Orchard 1 to Orchard Core ([see case study](https://lombiq.com/blog/git-hg-mirror-is-running-on-orchard-core)).<!-- #spell-check-ignore-line -->
+- The new [Hastlayer website](https://hastlayer.com/) when migrating it from Orchard 1 to Orchard Core ([see case study](https://lombiq.com/blog/modernization-and-migration-of-hastlayer-com)).<!-- #spell-check-ignore-line -->
 
 This module is also available on all sites of [DotNest, the Orchard SaaS](https://dotnest.com/).