Added blog on the Cross-Platform-App-Development

[HimanshuNarware]

Closes: #[#301]

Description of Changes

Added blog on the Cross-Platform-App-Development Added image to make blog more readable

Checklist:

• [x] My code adheres to the established style guidelines of this project.
• [x] I have conducted a self-review of my code.
• [ ] I have included comments in areas that may be difficult to understand.
• [ ] I have made corresponding updates to the project documentation.
• [x] My changes have not introduced any new warnings.

Screenshots