Update README.md

Author: rexzhang

README.md

@@ -1,20 +1,54 @@
 # Alfred Workflow: Time Converter
 
 ## What use
+
 ![demo-basic](docs/demo-basic.gif)
 
+## How
+
+### Change Time Zone
+
+```
+now +08
+```
+
+### Time Shift
+
+```
+now +1d
+now -1w
+```
+
+key | unit
+--- | ---
+ms | microseconds(not support yest)
+s | seconds
+m | minutes
+h | hours
+d | days
+w | weeks
+M | months
+q | quarters(not support yest)
+y | years
+
 ## Get it
-Download from [Github release](https://github.com/rexzhang/alfred-workflow-time-converter/releases), double click package file to install.
+
+Download
+from [Github release](https://github.com/rexzhang/alfred-workflow-time-converter/releases)
+, double click package file to install.
 
 ## History
 
 ### 0.1.0
+
 - first release
 
 ### 0.2.0
+
 - support time zone
 - support time shift
 
 ## Will
+
 - multi time shift args?
 - time shift support ms/q