[DOC] Add Nuclei to main README.md

Mainly display Nuclei processor support
Signed-off-by: Huaqi Fang <578567190@qq.com>

README.md

@@ -86,7 +86,7 @@ RT-Thread supports many architectures, and has covered the major architectures i
 - **ARM9**：manufacturers like Allwinner、Xilinx 、GOKE
 - **ARM11**：manufacturers like Fullhan
 - **MIPS32**：manufacturers like loongson、Ingenic
-- **RISC-V**：manufacturers like Hifive、Kendryte
+- **RISC-V**：manufacturers like Hifive、Kendryte、[Nuclei](https://nucleisys.com/)
 - **ARC**：manufacturers like SYNOPSYS
 - **DSP**：manufacturers like TI
 - **C-Sky**

README_zh.md

@@ -89,7 +89,7 @@ RT-Thread RTOS 支持许多架构，并且已经涵盖了当前应用中的主
 
 - MIPS32：如芯片制造商loongson、Ingenic
 
-- RISC-V：如芯片制造商Hifive、Kendryte
+- RISC-V：如芯片制造商Hifive、Kendryte、[芯来Nuclei](https://nucleisys.com/)
 
 - ARC：如芯片制造商SYNOPSYS