[Improvement]Update README.md

[debajoti]

Improvement Improving the readablity of the readme.md

Changes proposed ✍️

What

Making the crowd.dev description in readme.md more readable.

Why

There is some grammatical improvement.
No issue is created as it's very minor improvement

How

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.

[debajoti]

@joanagmaia I hope the updated pr has no issues.

[debajoti]

@joanagmaia any update??