Add README to NodeDebug folder

The NodeDebug folder is not intended to stand as a standalone dockerfile folder. It is a template used to generate the NodeChromeDebug and NodeFirefoxDebug folders. Note that the NodeChromeDebug and NodeFirefoxDebug folders are commited into the repo for the purposes of simplified builds on hub.docker.com. Part of #3
SeleniumHQ · Nov 20, 2014 · e6b28dc · e6b28dc
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+# Debug image template
+
+This folder is not meant to be build directly from the `docker build .` It only stands as a template for creating debug images derived from Selenium Node Browser images. Note usage in the Makefile at the root of this repo.