Prepare to publish on npm on release

Related to #23

.github/workflows/npm-publish.yml

@@ -0,0 +1,33 @@
+# This workflow will run tests using node and then publish a package to npm repository when a release is created
+# For more information see: https://help.github.com/actions/language-and-framework-guides/publishing-nodejs-packages
+
+name: Node.js Package
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+      - run: npm install
+      - run: npm test
+
+  publish-npm:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+          registry-url: https://registry.npmjs.org/
+      - run: npm install
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}

package.json

@@ -2,7 +2,7 @@
   "name": "jmap-client-ts",
   "version": "1.0.0",
   "description": "Jmap Library in Typescript",
-  "main": "jmap-client-ts.js",
+  "main": "lib/index.js",
   "scripts": {
     "build": "tsc",
     "lint": "eslint 'src/**/*.ts' 'tests/**/*.ts'",