Add github action for npm publish

.github/workflows/publish.yml

@@ -0,0 +1,34 @@
+name: Publish Package
+on:
+  release:
+    types: [created]
+jobs:
+  Publish:
+    runs-on: ubuntu-latest 
+    permissions: 
+      contents: read
+      packages: write 
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '12.x'
+          registry-url: 'https://registry.npmjs.org'
+      - name: Install
+        run: npm install
+      - name: Test
+        run: npm run test
+      - uses: codecov/codecov-action@v2
+        with:
+          files: coverage/*.json
+          flags: unittests
+          name: react-carousel-codecov
+          fail_ci_if_error: true
+          verbose: true 
+      - name: Build
+        run: npm run build
+      - name: Publish
+        run: npm publish --access=public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+