Update README.md

README.md

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 # docker-privoxy
 
-Docker file to build an image with privoxy service.
+Privoxy is a "privacy enhancing proxy", filtering Web pages and removing advertisements. This docker container runs privoxy over Alpine Linux in 6 Mb uncompressed image.
 
 The image can be pulled from https://hub.docker.com/r/caligari/privoxy/
+
+## Run privoxy
+
+(please, __read the security note below__)
+
+    docker run -d --name=privoxy -p 8118:8118 caligari/privoxy:latest
+    
+## Test privoxy
+
+      curl --proxy http://localhost:8118/ http://ifconfig.es
+      
+## Security note
+
+This container should be executed in a local host or in a VPN.
+
+Please, don't execute this docker in a host accesible from the internet with -p parameter because it __bypass the Linux firewall__ and you could be opening an __anonymous internet door__.
+