Update 'README.md'

README.md

@@ -1,2 +1,9 @@
 # gf
 
+安装gf命令行：
+```
+	wget -O gf https://github.com/gogf/gf/releases/latest/download/gf_$(shell go env GOOS)_$(shell go env GOARCH) && \
+	chmod +x gf && \
+	./gf install -y && \
+	rm ./gf
+```