增加GD32F405RG BSP

Author: ShiHongChao

bsp/README.md

@@ -215,6 +215,7 @@ This document is based on the RT-Thread mainline repository and categorizes the
 | [gd32303e-eval](gd32) | ✅ | ✅ | ✅ | - | - | ✅ | - | ✅ | ✅ | - | ✅ | - | ✅ |
 | [gd32305r-start](gd32) | ✅ | ✅ | ✅ | - | - | ✅ | - | ✅ | ✅ | - | ✅ | - | ✅ |
 | [gd32307e-start](gd32) | ✅ | ✅ | ✅ | - | - | ✅ | - | ✅ | ✅ | - | ✅ | - | ✅ |
+| [gd32405rg](gd32) | ✅ | ✅ | ✅ | - | ✅ | ✅ | ✅ | ✅ | ✅ | - | ✅ | - | ✅ |
 | [gd32407v-ickfb](gd32) | ✅ | ✅ | ✅ | - | - | ✅ | - | ✅ | ✅ | - | ✅ | - | ✅ |
 | [gd32407v-start](gd32) | ✅ | ✅ | ✅ | - | - | ✅ | - | ✅ | ✅ | - | ✅ | - | ✅ |
 | [gd32450z-eval](gd32) | ✅ | ✅ | ✅ | ✅ | - | ✅ | - | ✅ | ✅ | - | ✅ | - | ✅ |
@@ -953,4 +954,4 @@ This document is based on the RT-Thread mainline repository and categorizes the
 
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-*📅 Document Update Time: 2025-11-12 13:50:00*
+*📅 Document Update Time: 2025-11-12 13:50:00*