Added command line usage.

README.md

@@ -8,8 +8,6 @@
 
 A simple [JSP](http://www.oracle.com/technetwork/java/javaee/jsp/index.html) Tag Library to display the [code](#hscode), [reason](#hsreason) and/or [cause](#hscode) for [HTTP status codes](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html) in JSP error pages.
 
-----
-
 For example:
 
 ```jsp
@@ -34,8 +32,6 @@ would display on a [501 status code](http://www.w3.org/Protocols/rfc2616/rfc2616
 
     Not Implemented
 
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-
 ## hs:cause
 
 The `<hs:cause/>` tag displays the cause of current HTTP status code, if any. A shorthand for:
@@ -152,8 +148,6 @@ Status Code | Reason
 `598`       | Network Read Timeout Error
 `599`       | Network Connect Timeout Error
 
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-
 ## Usage with [Gradle](https://gradle.org/) or [Maven](http://maven.apache.org/)
 Include the following in your `build.gradle` file:
 
@@ -172,3 +166,33 @@ or as a Maven artifact:
     <version>1.0.4</version>
 </dependency>
 ```
+
+## Command Line Usage
+You can query the reason phrase for status code(s) as follows:
+
+```sh
+$ java -jar httpstatus-1.0.4.jar 404 500
+404: Not Found
+500: Internal Server Error
+```
+
+If no status code is specified, all status codes will be printed:
+
+```sh
+$ java -jar httpstatus-1.0.4.jar
+100: Continue
+101: Switching Protocols
+102: Processing
+103: Early Hints
+200: OK
+201: Created
+202: Accepted
+203: Non-Authoritative Information
+204: No Content
+205: Reset Content
+206: Partial Content
+207: Multi-Status
+208: Already Reported
+226: IM Used
+...
+```