Update README.md

README.md

@@ -1,10 +1,24 @@
 # gocomb
 sequence combination tool written in Golang
 
-# how to use `parser.go`
+# compile
+```
+git clone git@github.com:MalacoLab/gocomb.git
+cd gocomb
+go build
+```
+
+# how to use
+
+## convert fas to nex
+```
+./gocomb -o output.nex import.fas
+./gocomb import.fas
+```
+
+## combine serveral fas to single nex
 
 ```
-parser xxx.fas
-parser xxx.fas yyy.fas
-parser -o export.nex xxx.fas yyy.fas
+./gocomb import1.fas import2.fas
+./gocomb -o export.nex import1.fas import2.fas
 ```