risc-v doc

RISCV-ASM.md

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+simple risc-v hello world in asm
+
+risc-v is very promising, might be a good idea to look into a risc-v board to test on...
+- [Dongshan Nezha STU](https://linux-sunxi.org/DongshanPi_Nezha_STU)
+- [ESP32-C3](https://a.aliexpress.com/_mKsgL9m)
+
+deps:
+- qemu riscv
+- riscv toolchain (gcc,ld,as)
+
+run:
+```
+sh ./run.sh build
+```