Add blob about the new builder wizard options (#5378)

Author: jesserockz

content/changelog/2025.9.0.md

@@ -21,6 +21,7 @@ developer tools while maintaining backward compatibility for most use cases.
 **Key Highlights:**
 
 - **MIPI RGB Display support** for high-performance color displays with dedicated hardware acceleration
+- **ESPHome Builder improvements** with support for uploading existing YAML files and blank configurations
 - **Camera JPEG encoder** enabling efficient image compression and streaming capabilities  
 - **Enhanced NRF52 features** including DFU (Device Firmware Update) support
 - **Extensive memory optimizations** reducing flash and RAM usage across all platforms
@@ -62,6 +63,15 @@ ESPHome 2025.9.0 introduces comprehensive support for MIPI RGB displays through
 MIPI RGB displays offer superior performance for applications requiring high-quality graphics, smooth animations, and
 professional-grade user interfaces.
 
+## ESPHome Builder Enhancements
+
+The ESPHome Builder web interface now offers improved flexibility for getting started with your projects:
+
+**New Capabilities:**
+
+- **Upload existing YAML files** to continue working on configurations created elsewhere
+- **Start with a blank configuration** for complete customization from scratch
+
 ## Camera JPEG Encoder
 
 The new {{< docref "/components/camera/camera_encoder" >}} component adds efficient JPEG compression capabilities to