Migrate practice exercises to rescript

[tejasbubane]

• accumulate - Migrate accumulate exercise to rescript #173
• acronym - Migrate acronym exercise to rescript #174
• all-your-base - Migrate all-your-base exercise to rescript #175
• allergies - Migrate allergies exercise to rescript #179
• anagram - Migrate anagram exercise to rescript #180
• armstrong-numbers - Migrate armstrong-numbers exercise to rescript #182
• binary-search
• bob
• change
• hello-world - Migrate hello-world exercise to rescript #172
• isogram
• leap
• minesweeper
• pangram
• phone-number
• protein-translation
• raindrops
• resistor-color
• rna-transcription
• roman-numerals
• run-length-encoding
• space-age
• two-fer - Migrate two-fer exercise to rescript #184
• word-count

[JsonKim]

@tejasbubane Hi. I made a PR #219 to migrate to ReScript. Can you review? If you review it, I will try to work on other examples as well.