Copy files for Backend CRUD API `Students` from team02

[github-actions]

Dependencies

Do the "Create personal dokku dev deployment" issue first.

Acceptance Criteria:

• Backend API routes for CRUD operations for Students are
  available in Swagger (following the criteria from team02)

Implementation Details:

• Find Students.java in your team02 project in the directory
  src/main/java/edu/ucsb/cs156/example/entities
  and copy it into your team02 project in the same directory.
• Do the same for StudentsRepository.java from the directory
  src/main/java/edu/ucsb/cs156/example/repositorires
• Do the same for StudentsController.java from the directory
  src/main/java/edu/ucsb/cs156/example/controllers
• Do the same for StudentsControllerTests.java from the directory
  src/test/java/edu/ucsb/cs156/example/controllers
• Do the same for your database migration file for $Students, under /src/main/resources/db/migration/changes
• With these files in place, visit swagger and make sure
  the CRUD operations for Students are working properly.

What to do next

Make a PR: When you've met all of the acceptance criteria, do a PR for this branch,
being sure to enter a reasonable title
and description.

In the description, include the text "Closes #n" where n is the number of
this issue.

It is also helpful to include a screenshot of the Swagger endpoints so that
the person reviewing your PR knows what to test. It is helpful to
deploy your branch to your dokku dev instance, and include a link to the
swagger page on your dokku instance.

Then ask for a team member to review your PR.

Finally: drag this issue from "In Progress" to "In Review".

Review Others' PRs: Next, see if there are any PRs that need to be code reviewed and merged. Unless you are the
first person on your team to complete a PR, there likely is at least one.
See:

• General Code Review Advice
• Performing Code Reviews on Github

Start your next issue: Then, find the issue for "Create fixtures for Students" on the Kanban board in the ToDo column.

• Assign it to yourself
• Drag into "In Progress"
• Create a new branch, starting from the branch for the issue you just finished.
• Start on the new issue.