Add Homebrew instructions to getting started

This commit adds instructions for installing Elasticsearch via Homebrew
to the Getting Started guide.

Relates #26847

docs/reference/getting-started.asciidoc

@@ -148,6 +148,16 @@ And now we are ready to start our node and single cluster:
 ./elasticsearch
 --------------------------------------------------
 
+[float]
+=== Instalation with Homebrew
+
+On macOS, Elasticsearch can also be installed via https://brew.sh[Homebrew]:
+
+["source","sh"]
+--------------------------------------------------
+brew install elasticsearch
+--------------------------------------------------
+
 [float]
 === Installation example with MSI Windows Installer