Add CitriNet Notebook

[mengdih]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• 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 not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes

[narendasan]

Notebook looks good, can you add it to the index in the documentation? https://github.com/NVIDIA/Torch-TensorRT/blob/master/docsrc/index.rst

[narendasan]

Also @mengdih please sign your commits

[narendasan]

I think you need to squash these commits into one, DCO is still complaining about the original commit. Every commit needs to be signed. https://github.com/NVIDIA/Torch-TensorRT/pull/897/checks?check_run_id=5398369424

[vinhngx]

This branch is very outdated. "This branch is 2 commits ahead, 1491 commits behind NVIDIA:master."
I suggest forking an up to date master branch, then add the new notebook, also make change to README file, then make another PR.

[narendasan]

Bump on this PR @mengdih @vinhngx, still need the commits to be signed

[vinhngx]

Alternative MR submitted: #984
Pls kindly close this request @narendasan .