Feature add search functionality

[Lutheriel]

Description added search functionality

Fixes # (issue reference) https://github.com/ayushagg31/Trellis/issues/14

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist

• [x] I have read the Contribution Guidelines
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream module

[ayushagg31]

You have added functionality to search among the cards. Please add alert/msg for user when card is not found. Also replace the Search placeholder with appropriate text. Also, if possible add a highlight background in search text for user feasibility. Rest looks good, I'll review it in details later. Thanks for the contribution 😄

[Lutheriel]

added highlighting, new placeholder and alert.