Add notebooks and data from pyXem repos (from DJ)

Former-commit-id: c28118a1bb274065b1644522310c25755c054c25

Author: Joshua Taillon

notebooks/09 Parallel sessions/09c pyXem/09c_01 GaAs Nanowire - Data Inspection - Preprocessing - Unsupervised Machine Learning.ipynb

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+|doi|_ 
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+.. |doi| image:: https://zenodo.org/badge/DOI/10.5281/zenodo.2652869.svg
+.. _doi: https://doi.org/10.5281/zenodo.2652869
+
+pyXem is an open-source python library for crystallographic diffraction microscopy.
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+This repository contains `Jupyter notebooks <http://jupyter.org/>`__ demonstrating core functionality of the pyXem package.
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+Data required for the calibration & nanowire demos are available `here <https://drive.google.com/open?id=11CV7_wkFIsOtDICOcil8Bo25fo0NlR9I>`__ .
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+**Installation instructions and documentation can be found** `here <https://pyxem.github.io/pyxem>`__ .
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+If analysis using pyXem forms a part of published work please cite the package as explained `here <https://pyxem.github.io/pyxem>`__ and if these example notebooks are used, please cite the DOI at the top of this page.
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+If you have problems using any of the notebooks provided here please `raise an issue <https://github.com/pyxem/pyxem-demos/issues>`__ so that we can help.