Imports of chat command

PathSynopsis
flagPackage flag implements command-line flag parsing.
github.com/gorilla/websocketPackage websocket implements the WebSocket protocol defined in RFC 6455.
logPackage log implements a simple logging package.
net/httpPackage http provides HTTP client and server implementations.
text/templatePackage template implements data-driven templates for generating textual output.
timePackage time provides functionality for measuring and displaying time.