updated README.md

README.md

@@ -1,3 +1,22 @@
 # short_link_go
 
 Ghink Short Link Server with Go
+
+### How to use：
+
+Download, compile, and execute programs
+
+```
+# download
+git clone https://github.com/ghinknet/short_link_go
+
+# compile
+cd short_link_go
+go build main.go
+
+# run
+./main
+```
+Note:
+
+You have to init database before you start the program.