Add necessary changes for NPM publishing (#3021)

.npmignore

@@ -0,0 +1,25 @@
+#tests
+test
+coverage
+
+#build tools
+.travis.yml
+.jenkins.yml
+.codeclimate.yml
+.github
+azure-pipelines.yaml
+
+#linters
+.jscsrc
+.jshintrc
+.eslintrc*
+.dockerignore
+.eslintignore
+
+#editor settings
+.vscode
+
+#src
+docs
+docker
+images

README.md

@@ -29,6 +29,9 @@
         <a href="https://www.codacy.com/manual/Koenkk/zigbee2mqtt?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=Koenkk/zigbee2mqtt&amp;utm_campaign=Badge_Grade">
             <img src="https://api.codacy.com/project/badge/Grade/24f1e0fe39f04daa810e8a1416693d3f">
         </a>
+        <a href="https://www.npmjs.com/package/zigbee2mqtt">
+            <img src="https://img.shields.io/npm/v/zigbee2mqtt">
+        </a>
     </div>
     <h1>Zigbee2mqtt  🌉 🐝</h1>
     <p>

azure-pipelines.yaml

@@ -25,6 +25,14 @@ steps:
 - bash: npm run eslint
   displayName: 'Lint'
 
+# NPM
+- task: Npm@1
+  inputs:
+    command: publish
+    publishEndpoint: npm
+  displayName: 'Publish to npm'
+  condition: and(succeeded(), startsWith(variables['Build.SourceBranch'], 'refs/tags/'), ne(variables['Build.Reason'], 'PullRequest'))
+
 # Docker
 - task: DockerInstaller@0
   displayName: Docker install