Add simple CI

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: Freqtrade CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-18.04]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: npm install
+      uses: jaid/action-npm-install@v1.2.1
+      packageManager: npm
+
+    - name: run lint
+      run: |
+        npm run lint
+
+    # - name: Prettify code
+    #   uses: creyD/prettier_action@v2.2
+    #   with:
+    #     dry: True