Rename application.py to app.py

Doing so allows the associated article to drop the set FLASK_APP step for simplicity.

Also update .gitignore for VS Code, and update the readme.

Fix phrase to match screenshots

Merge pull request Azure-Samples#15 from scottclay/master

Made application.py PEP8 compliant.

Merge pull request Azure-Samples#15 from scottclay/master

Made application.py PEP8 compliant.

Merge pull request Azure-Samples#32 from Azure-Samples/dependabot/pip…

…/werkzeug-0.15.3

Bump werkzeug from 0.14.1 to 0.15.3

Update README.md

Update README.md

Update README.md