Add Build an Interactive SoundBoard with p5.js tutorial

[exrlla]

• [x] My project tutorial topic has already been approved by the Codédex team.
• [x] My project tutorial file renders properly in mdx.
• [x] My .mdx file follows the project template, as well as what's recommended in the content guidelines.
• [x] The content written is my own, and not plagiarized from other sources.
• [x] All code written is thoroughly functional and commented (or documented).
• [x] I have already completed a self-review of the project tutorial.
• [x] I will comply with changes made or recommended by the Codédex team about my project tutorial.