Add Apple as an Adopter (#5888)

* Add Apple as an Adopter

What this PR does: Adds Apple as an Adopter

We use and contribute to the Cortex project. We operate Cortex in
multiple regions and availability zones to provide a resilient datastore
service for AIML observability metric workloads with ingestion rates of
a billion+ per minute.

Signed-off-by: Charlie Le <charlie_le@apple.com>

* Update ADOPTERS.md

Co-authored-by: Friedrich Gonzalez <friedrichg@gmail.com>
Signed-off-by: Charlie Le <3375195+CharlieTLe@users.noreply.github.com>

---------

Signed-off-by: Charlie Le <charlie_le@apple.com>
Signed-off-by: Charlie Le <3375195+CharlieTLe@users.noreply.github.com>
Co-authored-by: Friedrich Gonzalez <friedrichg@gmail.com>

Author: CharlieTLe

ADOPTERS.md

@@ -4,6 +4,7 @@ This is the list of organisations that are using Cortex in **production environm
 
 * [Adobe](https://www.adobe.com)
 * [Amazon Web Services (AWS)](https://aws.amazon.com/prometheus)
+* [Apple](https://www.apple.com)
 * [Aspen Mesh](https://aspenmesh.io/)
 * [Buoyant](https://buoyant.io/)
 * [DigitalOcean](https://www.digitalocean.com/)