Add a README.md

This is a minimal Maven project implementing an ImageJ 1.x plugin

It is intended as an ideal starting point to develop new ImageJ 1.x plugins

in an IDE of your choice. You can even collaborate with developers using a

different IDE than you.

In [Eclipse](http://eclipse.org), for example, it is as simple as

_File>Import...>Existing Maven Project_

In [Netbeans](http://netbeans.org), it is even simpler: _File>Open_

Project. The same works in [IntelliJ](http://jetbrains.net).

If [jEdit](http://jedit.org) is your preferred IDE, you will need the [Maven

Plugin](http://plugins.jedit.org/plugins/?MavenPlugin).

Die-hard command-line developers can use Maven directly by calling _mvn_

in the project root.

However you build the project, in the end you will have the .jar file in the

_target/_ subdirectory. Simply copy it into your ImageJ's _plugins/_

directory, run _Help>Refresh Menus_ and the plugin will be available in

_Process>Process Pixels_ (this can be changed by editing

_src/main/resources/plugins.config_).