added myip-plugin

plugins/myip/README.md

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+# Goal
+This adds a simple command to find out your current public IPv4 address
+
+# Requirements
+* connection to the internet using a IPv4 address
+
+# Usage
+Type "myip" and get a line with your public IPv4 address back. Useful for
+bugfixing, ssh-ing to your parents computer and more ;-)
+
+This uses dig and opendns.com and is really nothing more than a convenient
+wrapper for not very complex command.
+
+# Improvements
+Ideas for improvements? Fork this or contact me.

plugins/myip/myip.plugin.zsh

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+# provide a command to find out your current external ip
+# using opendns resolver
+
+function myip() {
+    resolver="@resolver1.opendns.com"
+    ip="myip.opendns.com"
+    dig +short ${ip} ${resolver}
+}