Add plaintext file extensions

[timothycarambat]

Pull Request Type

• [ ] ✨ feat
• [ ] 🐛 fix
• [ ] ♻️ refactor
• [ ] 💄 style
• [ ] 🔨 chore
• [x] 📝 docs

Relevant Issues

resolves #2647 connects #2638

What is in this change?

• Adds more plaintext file extensions linq, cs, hpp

Additional Information

Developer Validations

• [ ] I ran yarn lint from the root of the repo & committed changes
• [ ] Relevant documentation has been updated
• [ ] I have tested my code functionality
• [ ] Docker build succeeds locally

[grantcarthew]

Love your work @timothycarambat Thanks mate.