doc: update README

DavidCai1111 · Nov 2, 2018 · 5898c8b · 5898c8b
1 parent 671845e
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diff --git a/README.md b/README.md
@@ -9,3 +9,11 @@ A tiny cli tool to get useful IP address information from a CIDR.
 ```
 go get -u -v github.com/DavidCai1993/cidr-cli
 ```
+
+## Usage
+
+```
+cidr-cli 192.168.23.35/21
+// output:
+// {"IPAvailable":2046,"netID":"192.168.16.0","mask":"fffff800"}
+```