add a github action that publishes the package on push to merge

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish to npm on Merge to Master
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: "14"
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Publish to npm
+        run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}