docs(readme): add animated build flow diagram to landing page (#490)

* docs(readme): add animated build flow diagram to landing page

* copilot suggestion

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: arodage

README.md

@@ -5,6 +5,12 @@
 
 A command-line tool for building custom Linux images from pre-built packages. Define what you need in a YAML template, run one command, and get a bootable RAW or ISO image.
 
+## How It Works
+
+![OS Image Composer Build Flow](./docs/architecture/assets/os-image-composer-build-flow.svg)
+
+The diagram above illustrates the overall build flow and may show representative or planned provider/architecture
+combinations. The table below lists the OS and architecture combinations that are currently supported.
 ## Supported Distributions
 
 | OS | Distribution | Architecture |