[doc] Add the Nordic chip and link

Signed-off-by: supperthomas <78900636@qq.com>

README.md

@@ -72,7 +72,7 @@ RT-Thread supports many architectures, and has covered the major architectures i
 
 - **ARM Cortex-M0/M0+**：manufacturers like ST
 - **ARM Cortex-M3**：manufacturers like ST、Winner Micro、MindMotion, ect.
-- **ARM Cortex-M4**：manufacturers like ST、Nuvoton、NXP、GigaDevice、Realtek、Ambiq Micro, ect.
+- **ARM Cortex-M4**：manufacturers like ST、Nuvoton、NXP、[Nordic](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nrf5x)、GigaDevice、Realtek、Ambiq Micro, ect.
 - **ARM Cortex-M7**：manufacturers like ST、NXP
 - **ARM Cortex-M23**：manufacturers like GigaDevice
 - **ARM Cortex-M33**：manufacturers like ST

README_de.md

@@ -72,7 +72,7 @@ RT-Thread unterstützt viele Architekturen und hat die wichtigsten Architekturen
 
 - **ARM Cortex-M0/M0+**：manufacturers like ST
 - **ARM Cortex-M3**：manufacturers like ST、Winner Micro、MindMotion, ect.
-- **ARM Cortex-M4**：manufacturers like ST、Nuvoton、NXP、GigaDevice、Realtek、Ambiq Micro, ect.
+- **ARM Cortex-M4**：manufacturers like ST、Nuvoton、NXP、[Nordic](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nrf5x)、GigaDevice、Realtek、Ambiq Micro, ect.
 - **ARM Cortex-M7**：manufacturers like ST、NXP
 - **ARM Cortex-M23**：manufacturers like GigaDevice
 - **ARM Cortex-M33**：manufacturers like ST

README_es.md

@@ -72,7 +72,7 @@ RT-Thread es compatible con muchas arquitecturas, y ha cubierto las principales
 
 - **ARM Cortex-M0/M0+**：manufacturers like ST
 - **ARM Cortex-M3**：manufacturers like ST、Winner Micro、MindMotion, ect.
-- **ARM Cortex-M4**：manufacturers like ST、Nuvoton、NXP、GigaDevice、Realtek、Ambiq Micro, ect.
+- **ARM Cortex-M4**：manufacturers like ST、Nuvoton、NXP、[Nordic](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nrf5x)、GigaDevice、Realtek、Ambiq Micro, ect.
 - **ARM Cortex-M7**：manufacturers like ST、NXP
 - **ARM Cortex-M23**：manufacturers like GigaDevice
 - **ARM Cortex-M33**：manufacturers like ST

README_zh.md

@@ -83,7 +83,7 @@ RT-Thread RTOS 支持许多架构，并且已经涵盖了当前应用中的主
 
 - ARM Cortex-M0/M0+：如芯片制造商 ST
 - ARM Cortex-M3：如芯片制造商 ST、全志、灵动等.
-- ARM Cortex-M4：如芯片制造商 ST、Nuvoton、NXP、GigaDevice、Realtek、Ambiq Micro等
+- ARM Cortex-M4：如芯片制造商 ST、Nuvoton、NXP、[Nordic](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nrf5x)、GigaDevice、Realtek、Ambiq Micro等
 - ARM Cortex-M7：如芯片制造商 ST、NXP
 - ARM Cortex-M23：如芯片制造商 GigaDevice
 - ARM Cortex-M33：如芯片制造商 ST