add mvc instruction

Author: KaKeimei

README.md

@@ -33,9 +33,16 @@ replace the following stratum url and userName, password is same as userName.
 
 you can also change threads count according to your cpu cores.
 
-./minerd -o stratum+tcp://mine.mvcpool.com:6666 -a sha256d -O userName:userName -D -P --threads=4
+```shell
+
+./minerd -o stratum+tcp://mine.mvcpool.com:6666 -a sha256d -O userName:password -D -P --threads=4
+
+```
+
 Asic miner is also the same, configure your stratum url and userName, then start mining
 
+password is the same as userName
+
 
 # 2. Mining on your own node
 ## Operating System Environment