add: Adding styled-components and @types/styled-components

[GuScarpim]

Issue:
#12

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[arvind0598]

#12 was already assigned to Emma, so ideally you wouldn't be working on it - adding @types/styled-components should have been a comment on the issue rather than a full blown PR. However, seeing as you've already done it, we can probably let this one slide. Thanks for the contribution, I'll merge it as part of #18.