Update README.md

Author: lmangani

README.md

@@ -21,6 +21,20 @@ Next-Generation [HEP](https://github.com/sipcapture/hep) Capture Agent in Rust
 * Static _(work in progress)_
   `docker build -t sipcapture/hepagent-static -f docker/Dockerfile-static .`
 
+---------
+#### Usage
+```
+# hepagent --help
+Usage: hepagent [options] (-i <intf> | -r <pcap>)
+       hepagent --version
+       hepagent --help
+
+Options:
+    -i <intf>, --interface <intf>    Listen on interface. [default: any]
+    -r <pcap>, --read-file <pcap>    Read pcap file.
+    --hep-server <server>            HEP UDP server address. [default: 127.0.0.1:9060]
+```
+
 ---------
 
 #### Developers