v0.3: rparke's code (#1)

* rparkes code

* Create python-app.yml

* Added .gitignore

* removed __pycache__/

* removed docs/build/

* Update .gitignore

* removed pycache

* updated git ignore

* made recommended changes

* Updated .gitignore

* Removed .DS_Store

* restarted kernel for tutoral notebooks

* Update python-app.yml

* updated .gitignore

* updated .gitignore

* Added DataSource.ipynb tutorial

* Updated contact and docs details

* added conftest.py

* removed excess conftest.py not needed

* Update setup.py

* Update python-app.yml

* Capitalised NeXus

* updated .gitignore

Co-authored-by: Richard Parke <richardparke@Richards-MacBook-Air.local>