chore(prettier): Add prettier, pr template

[alvinsj]

Story: repo setup chore

1. Why this change is required?
   • Improve code style
2. What problem does it solve?
   • Add prettier to format files, eslint to fix semi, max-len, console

Implementation

1. add prettier and config
2. add eslint rules for max-len, no-console, no semicolon
3. add lint step
4. add pr template
5. fix files to satisfy linter

Checklist

• Fulfilled specs
• Ensured code is readable
• Consistency in architecture
• Added Test: not required