Add PDF and epub for github actions

Author: sudheerj

.github/workflows/main.yaml

@@ -0,0 +1,32 @@
+name: Advanced Usage
+
+on: [push, pull_request]
+
+env:
+  FILE_NAME: vuejs-interview-questions
+
+jobs:
+  convert_via_pandoc:
+    runs-on: ubuntu-18.04    
+    steps:      
+      - uses: actions/checkout@v2    
+
+      - name: Create output directory
+        run: |
+          mkdir output  # create output dir          
+      
+      - name: Create PDF
+        uses: docker://pandoc/latex:2.10
+        with:
+          args: --pdf-engine=xelatex --output=output/${{env.FILE_NAME}}.pdf README.md
+
+      - name: Create epub
+        uses: docker://pandoc/latex:2.10
+        with:
+          args: --output=output/${{env.FILE_NAME}}.epub README.md
+      
+      - name: Upload
+        uses: actions/upload-artifact@master
+        with:
+          name: output
+          path: output