Add GitHub Actions

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: Checks
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  typescript:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+    
+    - name: Install dependencies
+      run: yarn install --frozen-lockfile
+
+    # Type checks
+    - name: TypeScript Error Reporter
+      uses: andoshin11/typescript-error-reporter-action@v1.0.2
+
+    # ESLint
+    - name: ESLint Action
+      uses: hallee/eslint-action@1.0.1
+
+    # Prettier
+    - name: Prettify the JS Code
+      uses: creyD/prettier_action@v2.1
+      with:
+        prettier_options: '--write *.{js,ts,tsx}'
+        branch: master
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}