configure github actions

Author: viqueen

.github/workflows/npm-test.yaml

@@ -0,0 +1,18 @@
+name: ecdsa-node Test
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 16
+      - run: npm ci
+      - run: npm run lint
+      - run: npm test