Update README.txt

Add the method of how to test file

Author: eriktai

README.md

@@ -12,9 +12,13 @@ How to compile it:
 ```shell
 $ gcc -O3 -Wall -lelf emu-rv32i.c -o emu-rv32i
 ```
+or
+```shell
+$ make emu-rv32i
+```
 
-Run RV32I compliance tests.
-Assume `emu-rv32i` in `$PATH` environment variable.
+Passed RV32I compliance tests from https://github.com/riscv/riscv-compliance
+- Must install the [risc-v toolchain](https://xpack.github.io/riscv-none-embed-gcc/)
 ```shell
 $ git clone https://github.com/riscv/riscv-compliance
 $ cd riscv-compliance
@@ -23,12 +27,7 @@ $ make RISCV_PREFIX=riscv-none-embed- RISCV_DEVICE=rv32i TARGET_SIM=emu-rv32i va
 
 Compiling and running simple code:
 ```shell
-$ riscv32-unknown-elf-gcc -O3 -nostdlib test1.c -o test1
-```
-
-or
-```shell
-$ riscv64-unknown-elf-gcc -march=rv32i -mabi=ilp32 -O3 -nostdlib test1.c -o test1
+$ make test1
 ```
 
 then
@@ -37,6 +36,13 @@ $ ./emu-rv32i test1
 Hello RISC-V!
 ```
 
+Passed RV32C compliance tests from https://github.com/riscv/riscv-compliance
+``shell
+make C-ADDI.log
+```
+If there is no accident, it will output the `TEST PASSED`
+
+
 RV32M and RV32A instructions may be enabled by commenting `#define STRICT_RV32I`.
 
 ## How to build RISC-V toolchain from scratch