add vmessspeed doc

README.md

@@ -62,4 +62,51 @@ rtt min/avg/max = 761/1002/1368 ms
 git clone https://github.com/v2fly/vmessping.git
 cd vmessping/cmd/vmessping
 go build
+```
+
+# Other tools
+
+## VmessSpeed
+
+Speedtest for vmess.
+
+### Usage
+```
+
+./vmessspeed --help
+usage: vmessspeed [<flags>] <vmess>
+
+Flags:
+      --help               Show context-sensitive help (also try --help-long and --help-man).
+  -l, --list               Show available speedtest.net servers
+  -d, --debug              Show v2ray core debug log
+  -s, --server=SERVER ...  Select server id to speedtest
+  -t, --timeout=TIMEOUT    Define timeout seconds. Default: 10 sec
+      --version            Show application version.
+
+Args:
+  <vmess>  the vmesslink
+
+```
+
+### Example
+
+```
+D:\>vmessspeed_amd64_windows.exe -s 14791 vmess://.....
+
+Type: ws
+Addr: v2-server.address
+Port: 80
+UUID: 00000000-0000-0000-0000-000000000000
+PS: @describe
+
+Testing From IP: ...IP..ADDR....
+
+Target Server: [14791]    63.21km Macau (Macau) by MTel
+Latency: 21.005ms
+Download Test: ................11.97 Mbit/s
+Upload Test: ................15.11 Mbit/s
+
+Download: 11.97 Mbit/s
+Upload: 15.11 Mbit/s
 ```