Add pre-commit command to run eslint fix and type check of flow

[wt-lin]

Description

• Add husky devDependency for pre-commit
• Steps, after pulling
  • yarn install
  • yarn prepare in the project root folder
  • Enjoy it when committing your code

[wt-lin]

Hi @kevinjcliao, please check if this works after following the steps. Thank you.

[wt-lin]

By the way, I'd like to include backend's lint fixing command in that hook. But I'm not sure if you need that or not. How do you think?

[kevinjcliao]

Confirm this works. Thank you! If you want to cover Python, it would be as simple as: yarn lint; yarn tc.

[kevinjcliao]

I would like to include Python!

[kevinjcliao]

Thank you so much for your work on this!