[Feature] Add discord link on front page (README.md)

[sujee]

Search before asking

• [X] I searched the issues and found no similar issues.

Component

Other

Feature

recommending adding discord link in README.md ... something like this

Get Support

Have questions or feedback? Join us on Discord server.

Data Prep Kit Discord Channel
invite link

Are you willing to submit a PR?

• [X] Yes I am willing to submit a PR!