3: demo application is added

[osvalda]

Pull Request

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

Fixes # (issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[github-actions]

Code Coverage Information

Code Coverage summary

Lines	Statements	Branches	Functions
	95.38% (62/65)	95.16% (59/62)	88.88% (8/9)

Coverage details (95%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	95.38	95.16	88.88	95.16
smart-time-input.tsx	87.5	78.57	83.33	87.5	44, 53, 69
utils.ts	100	100	100	100