Hangar Real World Quick Start Tutorial (#188)

* New Hangar Quick Start Tutorial - download and organize Imagenette data

* Add Column initialization, Adding data and Committing changes section

* Fix validation data loading, add more comments

* Add Alessia as author

* Change name of the checkout object, add a note for larger dataset reading

* Update Tutorial-QuickStart.ipynb

* Fix paths and commit id

* Change title, minor fixes

* Fix typo

* Minor fixes

Co-authored-by: Rick Izzo <[email protected]>

Author: alessiamarcolini

AUTHORS.rst

@@ -3,4 +3,5 @@ Authors
 
 * Richard Izzo - [email protected]
 * Luca Antiga - [email protected]
-* Sherin Thomas - [email protected]
+* Sherin Thomas - [email protected]
+* Alessia Marcolini - [email protected]