doc update

README.md

@@ -1 +1,39 @@
-# mqtt-sh
+# Mqtt-cli
+This a simple mqtt-cli application written in [Go](https://golang.org/). It has pub sub command which is suite for the shell script pipelining.
+
+# Install
+If you have golang ready environment, you can easily install it
+```
+go get github.com/shuza/mqtt-cli
+```
+
+# Usage
+You can set host, port, clientId, topic and qos on the Environment variables.
+```
+export MQTT_HOST="localhost"
+export MQTT_PORT="1883"
+export MQTT_CLIENT_ID="mqtt-cli"
+export MQTT_TOPIC="/test/mqtt/cli"
+export MQTT_QOS="1"
+```
+Or you can use flags to do it.
+
+|   Name   |    Short Hand |    Description     |
+|:----------:|:-------------:|:------------:|
+| address    |      a        | Set MQTT host address |
+| port       |      p        | Set MQTT host port    |
+| clientId   |      i        | Set MQTT client ID    |
+| topic      |      t        | Set MQTT topic        |
+| qos        |      q        | Set MQTT service quality |
+| message    |      m        | Set MQTT message palyload |
+
+# Sub
+```
+mqtt-cli sub -a "localhost" -p 1883 -t "/tmp/a"
+```
+
+# Pub
+```
+mqtt-cli pub -a "localhost" -p 1883 -t "/tmp/a" -m "thsi is to test"
+```
+![Solid](https://media.giphy.com/media/JpGXXxiamqV53gqleB/giphy.gif)