Add code snippet tags to app.py

[Dickson-Mwendia]

Purpose

• Add code snippet tags for out-of-repo code snippet ingestion

Does this introduce a breaking change?

[ ] Yes [x] No 

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix [ ] Feature [ ] Code style update (formatting, local variables) [ ] Refactoring (no functional changes, no api changes) [X] Documentation content changes [ ] Other... Please describe: 

How to Test

• Get the code

git clone [repo-address] cd [repo-name] git checkout [branch-name] npm install 

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[Dickson-Mwendia]

Thanks @ckittel for the call-outs. I've resolved the issues raised as per your feedback. Let me know if it LGTM

[ckittel]

LGTM!