Added Wishlist add and delete functions

[adarsh-technocrat]

Issue Number

fixes #256

Describe the changes you've made

Describe if there is any unusual behavior (Any Warning) of your code(Write NA if there isn't)

Added Wishlist add and delete functions

Additional context (OPTIONAL)

Test plan (OPTIONAL)

A good test plan should give instructions that someone else can easily follow.

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] All new and existing tests passed.
• [x] The title of my pull request is a short description of the requested changes.

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