feature(use): add pptxgen to deps; basic implementation #60

Author: singerla

package.json

@@ -59,6 +59,7 @@
     "@xmldom/xmldom": "^0.8.6",
     "extract-zip": "^2.0.1",
     "jszip": "^3.10.1",
+    "pptxgenjs": "^3.12.0",
     "regexp.escape": "^1.1.0"
   }
 }