Added workflow to publish package

.github/workflows/npm-publish.yml

@@ -0,0 +1,30 @@
+name: Publish NPM Package
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+          registry-url: https://registry.npmjs.org/
+      - run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+
+  publish-gpr:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+          registry-url: https://npm.pkg.github.com/
+      - run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}