[Fix] Add Readme for doc generation

doc/README.MD

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+# Documentation Generation
+
+## Index
+
+-   ``Devel``: Contains *.rst files for Developer Guide
+-   ``examples``: Dipy app showcases. Add any tutorial here
+-   ``examples_built``: keep it empty. Only for examples generation
+-   ``releases_notes``: Contains all API changes / PR-issues resolve for a specific release
+-   ``sphinx_ext``: Sphinx custom plugins
+-   ``theory``: Diffusion theory + FAQ files
+-   ``tools``: Scripts to generate some part of the documentation like API 
+-   ``build``: Contains the generated documentation
+-   ``_static``: Contains images, css, js for Sphinx to look at 
+-   ``_templates``: Contains html layout for custom sphinx design
+
+## Doc generation steps:
+
+### Installing requirements
+
+```bash
+$ pip install -U -r doc-requirements.txt
+```
+
+### Generate all the Documentation
+
+#### Under Linux and OSX
+
+```bash
+$ make -C . clean && make -C . html
+```
+
+#### Under Windows
+
+```bash
+$ ./make.bat clean
+$ ./make.bat html
+```

doc/doc-requirements.txt

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+cython
+numpy
+scipy
+nibabel>=2.3.1
+h5py
+cvxpy
+pandas
+tables
+matplotlib
+fury
+scikit-learn
+scikit-image
+statsmodels