Add github actions workflows

Author: AXeL-dev

.github/workflows/deploy-demo.yml

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+name: Build and Deploy Demo
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v2.3.1 # If you're using actions/checkout@v2 you must set persist-credentials to false in most cases for the deployment to work correctly.
+        with:
+          persist-credentials: false
+
+      - name: Install and Build 🔧
+        run: |
+          npm install
+          npm run build:demo:github
+          cp dist/demo/index.html dist/demo/404.html
+
+      - name: Deploy 🚀
+        uses: JamesIves/github-pages-deploy-action@3.6.2
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH: gh-pages # The branch the action should deploy to.
+          FOLDER: dist/demo # The folder the action should deploy.
+          CLEAN: true # Automatically remove deleted files from the deploy branch

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Build and Publish to NPM
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v2
+      
+      - name: Setup node 🔨
+        uses: actions/setup-node@v2
+        with:
+          node-version: 12
+          registry-url: https://registry.npmjs.org/
+
+      - name: Install and Build 🔧
+        run: |
+          npm install
+          npm run build
+
+      - name: Publish to NPM 🚀
+        run: cd dist/ngx-diff2html && npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}