Add github build and publish workflows

.github/workflows/build.yml

@@ -0,0 +1,31 @@
+name: Build
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10, 12, 14, 15]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install
+        run: npm install
+
+      - name: Link check
+        run: npm run lint
+
+      - name: Tests and benchmark
+        run: npm run test && npm run benchmark

.github/workflows/publish.yml

@@ -0,0 +1,18 @@
+name: Publish
+on:
+  release:
+    types: [created]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      # Setup .npmrc file to publish to npm
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+          registry-url: "https://registry.npmjs.org"
+      - run: npm install
+      - run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

README.md

@@ -1,7 +1,13 @@
 # Banknote
+[![NPM](https://nodei.co/npm/banknote.png)](https://npmjs.org/package/banknote)
 
 Banknote is a small, easy-to-use JavaScript library that provides a simple way to format monetary amounts in multiple locales and currencies. It’s mainly targeted at Node.js, but also works in the browser (if needed) with module bundlers like [Webpack](https://webpack.github.io/) and [Browserify](http://browserify.org/).
 
+
+![build](https://github.com/zalando-incubator/banknote/actions/workflows/build.yml/badge.svg)
+[![downloads](https://img.shields.io/npm/dt/banknote.svg)](https://npmjs.org/package/banknote?cacheSeconds=3600)
+[![version](https://img.shields.io/npm/v/banknote.svg)](https://npmjs.org/package/banknote?cacheSeconds=3600)
+
 ## Features
 
 Banknote addresses a common problem faced by anyone (for example, an e-commerce company) who has to update and format prices on the frontend. It is different from similar projects in that it follows Unicode CLDR formatting standards, not an ad hoc data solution. It also: