ESLint Github workflow

eslint.yml

name: ESLint

on:
  pull_request:
    branches:
      - master
      - develop
jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-node@v2
        with:
          node-version: "15"
      - name: Install modules
        run: npm install
      - name: Run ESLint
        run: npx eslint . --ext .js,.jsx,.ts,.tsx