Create Sprint model and SprintController with CRUD operations using repository design pattern

[sweep-ai]

Description

This pull request adds the following changes:

• Created a new model called "Sprint" in the app directory.
• Created a new controller called "SprintController" in the app/Http/Controllers directory.
• Added methods for creating, reading, updating, and deleting Sprint instances in the SprintController.
• Created a new repository called "SprintRepository" in the app/Repositories directory.
• Added methods for interacting with the database in the SprintRepository.
• Created a migration file xxxx_xx_xx_xxxxxx_create_sprints_table.php in the database/migrations directory to define the structure of the "sprints" table.

Summary

This pull request addresses the issue #5 by adding the necessary code to create a new model called "Sprint" and a corresponding controller "SprintController" with all CRUD operations using the repository design pattern. The code follows the Laravel framework conventions and provides a clean and organized structure for managing Sprint instances in the project.

Fixes #5.

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To checkout this PR branch, run the following command in your terminal:

git checkout sweep/sprint-controller_1

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