docs: Update README.md

[miquelbeltran]

docs: Update README.md

Description 📝

• Purpose: Add badges to the README and cleanup a bit the installation instructions.
• Approach: Modify README.md

Type of change

• Docs

Updates

• Changed the Install section, moved the dart requirement instructions.
• Added badges for GitHub releases and pub.dev, including links (see screenshot)

Screenshots 📷

Test plan 🧪

• None, only docs changed

Author to check 👓

• Project and all contained modules builds successfully
• Self-/dev-tested
• Unit/UI/Automation/Integration tests provided where applicable
• Code is written to standards
• Appropriate documentation written (code comments, internal docs)

Reviewer to check ✔️

• Project and all contained modules builds successfully
• Change has been dev-/reviewer-tested, where possible
• Unit/UI/Automation/Integration tests provided where applicable
• Code is written to standards
• Appropriate documentation written (code comments, internal docs)

[TheRealAgentK]

LGTM