Adding README.md about notebook development.

IPython/frontend/html/notebook/README.md

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+# IPython Notebook development
+
+# Development dependencies
+
+Developers of the IPython Notebook will need to install the following tools:
+
+* fabric
+* node.js
+* less (`npm install -g less`)
+* bower (`npm install -g bower`)
+
+# Components
+
+We are moving to a model where our JavaScript dependencies are managed using 
+[bower](http://bower.io/). These packages are installed in `static/components`
+and commited into our git repo. Our dependencies are described in the file
+`static/bower.json`. To update our bower packages, run `fab components` in this
+directory.
+
+Because CodeMirror does not use proper semantic versioning for its GitHub tags,
+we maintain our own fork of CodeMirror that is used with bower. This fork should
+track the upstream CodeMirror exactly; the only difference is that we are adding
+semantic versioned tags to our repo.
+
+# less
+
+If you edit our `.less` files you will need to run the less compiler to build
+our minified css files.  This can be done by running `fab css` from this directory.
+