Exercises to port

[BNAndras]

Here are some exercises I'd like to port over the next few weeks.

• [x] Armstrong Numbers
• [ ] Flatten Array

Done

• [x] Binary Search
• [x] Collatz Conjecture
• [x] Darts
• [x] Eliud's Eggs
• [x] ETL
• [x] Grains
• [x] Hamming
• [x] High Scores
• [x] Isogram
• [x] Leap
• [x] Pangram
• [x] Protein Translation
• [x] Raindrops
• [x] Resistor Color
• [x] Resistor Color Duo
• [x] Robot Simulator
• [x] Roman Numerals
• [x] Space Age
• [x] Square Root
• [x] Strain

[BNAndras]

@ErikSchierboom, I have some new exercise PRs for your review. Once these are merged in, I'll rebase #237 and sort the practice exercises by displayed difficulty and then name.

[ErikSchierboom]

@BNAndras I've reviewed them