Improve CLI option documentation

README.md

@@ -39,6 +39,23 @@ Guide. Typically, running Registrator looks like this:
   gliderlabs/registrator:latest \
   consul:https://localhost:8500
 
+## CLI Options
+```
+Usage of /bin/registrator:
+ /bin/registrator [options] <registry URI>
+
+ -cleanup=false: Remove dangling services
+ -deregister="always": Deregister exited services "always" or "on-success"
+ -internal=false: Use internal ports instead of published ones
+ -ip="": IP for ports mapped to the host
+ -resync=0: Frequency with which services are resynchronized
+ -retry-attempts=0: Max retry attempts to establish a connection with the backend. Use -1 for infinite retries
+ -retry-interval=2000: Interval (in millisecond) between retry-attempts.
+ -tags="": Append tags for all registered services
+ -ttl=0: TTL for services (default is no expiry)
+ -ttl-refresh=0: Frequency with which service TTLs are refreshed
+ ```
+
 ## Contributing
 
 Pull requests are welcome! We recommend getting feedback before starting by