Update README

[JoeDravarol]

Proposal:

• Add a description on what our project is/does.
• Update the contributor list to include: @thecornisians, @CodingWithDan and @Mire-web.
• Add an acknowledgement section to acknowledge the Pokemon TCG API used for backend or other resources if applicable.
• Add a gif/video of the project.

[Dex-theDev]

Adding a gif/video of the project would be ideal

[JoeDravarol]

Good idea!