Added tutorial on advanced usage of dictionaries

[drentsoft]

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1. This pull request resolves #72

2. Description

Added tutorial on advanced usage of dictionaries with appropriate challenge. Covers collections as values Deleting key pair values Popping values Updating dictionaries

Does not cover iteration of keys, values or pairs. Will try to open a new issue for this.

3. Fill in checklist by marking [x]

• [x] I've read the CONTRIBUTING.md
• [x] I was assigned to this issue
• [x] My code is formatted using required linting
• [x] I've run my code locally and checked it works

[funbeedev]

@drentsoft advanced but well explained. I appreciate your contributions to this repo 😄

[drentsoft]

Thanks 😄