Add antigen compatible plugin description

gitflow-avh.plugin.zsh

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+# This allows the gitflow-avh commands to be installed in ZSH using antigen.
+# Antigen is a bundle manager. It allows you to enhance the functionality of
+# your zsh session by installing bundles and themes easily.
+
+# Antigen documentation:
+# http://antigen.sharats.me/
+# https://github.com/zsh-users/antigen
+
+# Install gitflow-avh:
+# antigen bundle petervanderdoes/gitflow-avh --branch=master
+# Bundles installed by antigen are available for use immediately.
+
+# Update gitflow-avh (and all other antigen bundles):
+# antigen update
+
+# The antigen command will download the git repository to a folder and then
+# execute an enabling script (this file). The complete process for loading the
+# code is documented here:
+# https://github.com/zsh-users/antigen#notes-on-writing-plugins
+
+# This specific script just adds the project folder to the PATH. This makes all
+# commands available in git.
+export PATH="${PATH}":`dirname "${0}"`