add readme documentation

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,11 @@
+## Problem statement
+
+Please remove the sections that don't apply
+
+## Steps to reproduce
+
+## Environment
+
+go-external-ip commit: 
+go version:
+OS:

README.md

@@ -1,6 +1,69 @@
-# Go External IP
+# Go External IP [![license](https://img.shields.io/github/license/glendc/go-external-ip.svg)](https://github.com/GlenDC/go-external-ip/blob/master/LICENSE.txt)
 
-TODO:
+A Golang library to get your external ip from multiple services.
 
-+ README Documentation;
-+ Unit-Tests;
+## TODO
+
++ Unit-Tests + CI (Travis);
++ Investigate support for (a) STUN protocol(s);
+
+## Docs
+
+https://godoc.org/github.com/GlenDC/go-external-ip
+
+## Usage
+
+Using the library can as simple as the following (runnable) example:
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/glendc/go-external-ip"
+)
+
+func main() {
+    // Create the default consensus,
+    // using the default configuration and no logger.
+    consensus := externalip.DefaultConsensus(nil, nil)
+    // Get your IP,
+    // which is never <nil> when err is <nil>.
+    ip, err := consensus.ExternalIP()
+    if err == nil {
+        fmt.Println(ip.String()) // print IPv4/IPv6 in string format
+    }
+}
+```
+
+Please read [the documentation][docs] for more information.
+
+## exip
+
+This library also comes with a standalone command line application,
+which can be used to get your external IP, directly from your terminal.
+
+### install
+
+```
+$ go install github.com/glendc/go-external-ip/cmd/exip
+```
+
+### usage
+
+```
+$ exip -h
+Retrieve your external IP.
+
+Usage:
+    exip [flags]
+
+Flags:
+  -h help
+    	show this usage message
+  -t duration
+    	consensus's voting timeout (default 5s)
+  -v	log errors to STDERR, when defined
+```
+
+[docs]: https://godoc.org/github.com/GlenDC/go-external-ip