Add solution for gin challenge-1-basic-routing by Johrespi

[Johrespi]

gin challenge-1-basic-routing Solution

Submitted by: @Johrespi Package: gin Challenge: challenge-1-basic-routing

Description

This PR contains my solution for gin challenge-1-basic-routing.

Changes

• Added solution file to packages/gin/challenge-1-basic-routing/submissions/Johrespi/solution.go

Testing

• [x] Solution passes all test cases
• [x] Code follows Go best practices

Thank you for reviewing my submission! 🚀