Added answers for the first 7 exercises

[jarede-dev]

Complete the following REQUIRED checkboxes:

• [x] I have thoroughly read and understand The Odin Project Contributing Guide
• [x] The title of this PR follows the location of change: brief description of change format, e.g. 01_helloWorld: Update test cases

Complete the following checkboxes ONLY IF they are applicable to your PR. You can complete them later if they are not currently applicable:

• [x] I have ensured any exercise files included in this PR have passed all of their tests

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1. Because:

Closes #XXXXX

2. This PR:

3. Additional Information: