Recreated LEGO Bricks Widget README. (#4792)

* Recreated LEGO Bricks Widget README

* Moved LEGO Bricks Widget section from main README to a new file as requested

* Restored LEGO Bricks Widget section in guide/README.md as requested

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Co-authored-by: Roshni Pradeep Naktode <roshnipradeepnaktode@Roshnis-MacBook-Air.local>

Author: roshninaktode