tutorial for dataloader

[hhsecond]

Motivation and Context

Why is this change required? What problem does it solve?:

If it fixes an open issue, please link to the issue here:

Description

Describe your changes in detail:

Screenshots (if appropriate):

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Documentation update
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Is this PR ready for review, or a work in progress?

• Ready for review
• Work in progress

How Has This Been Tested?

Put an x in the boxes that apply:

• Current tests cover modifications made
• New tests have been added to the test suite
• Modifications were made to existing tests to support these changes
• Tests may be needed, but they are not included when the PR was proposed
• I don't know. Help!

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have signed (or will sign when prompted) the tensorwork CLA.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #117 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
+ Coverage   92.25%   92.38%   +0.13%     
==========================================
  Files          50       50              
  Lines        8622     8622              
  Branches      843      843              
==========================================
+ Hits         7954     7965      +11     
+ Misses        492      481      -11     
  Partials      176      176

Impacted Files	Coverage Δ
src/hangar/backends/hdf5_00.py	90.38% <0%> (+4.23%)	⬆️

[rlizzo]

This looks good @hhsecond! Thanks for the writeup!