docs: lead the README with the project diagram

Author: blackwell-systems

README.md

@@ -1,3 +1,7 @@
+<p align="center">
+  <img src="assets/gcf-python-diagram.png" alt="gcf-python" width="100%">
+</p>
+
 <p align="center">
   <a href="https://github.com/blackwell-systems"><img src="https://raw.githubusercontent.com/blackwell-systems/blackwell-docs-theme/main/badge-trademark.svg" alt="Blackwell Systems"></a>
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-MIT-blue.svg" alt="License"></a>