Update README.md to include a pointer to the NGINX Community Forum (#7870)

* Update README.md to include a pointer to the NGINX Community Forum

Added a specific pointer to the Commuity Forum for additional touchpoint with NIC

Signed-off-by: Dave McAllister <[email protected]>

Author: dwmcallister

README.md

@@ -39,6 +39,8 @@ We value community input and would love to see you at the next community call. A
 | **2025-09-08**           |
 | **2025-09-22**           |
 
+You can also join the [NGINX Community Forum](https://community.nginx.org) to chat about the NGINX Ingress Controller.
+
 ---
 
 NGINX Ingress Controller works with both NGINX and NGINX Plus and supports the standard Ingress features - content-based