Create README.MD

SpeedTest/README.MD

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+# Install
+```
+wget -qO- https://github.com/showwin/speedtest-go/releases/download/v1.7.10/speedtest-go_1.7.10_Linux_x86_64.tar.gz |tar -zxv speedtest-go
+
+```
+
+# Use
+```
+./speedtest-go --custom-url=http://speedtest1.online.sh.cn:8080
+./speedtest-go --custom-url=http://speedtest.hk.chinamobile.com:8080
+
+
+```