add viewerjs

package.json

@@ -20,6 +20,7 @@
     "randomcolor": "^0.5.3",
     "rasterizehtml": "^1.3.0",
     "register-service-worker": "^1.5.2",
+    "viewerjs": "^1.3.6",
     "vue": "^2.5.22",
     "vue-awesome": "^3.2.0",
     "vue-echarts": "^3.1.3",

yarn.lock

@@ -9960,6 +9960,11 @@ verror@1.10.0:
     core-util-is "1.0.2"
     extsprintf "^1.2.0"
 
+viewerjs@^1.3.6:
+  version "1.3.6"
+  resolved "https://registry.yarnpkg.com/viewerjs/-/viewerjs-1.3.6.tgz#5b2e68c48623f2ef117da2e2a382059cab147df9"
+  integrity sha512-3SCxFtvFP+mPzudBNexUA0eTI6pjCP+xlJLENs9SyaocWXUq0Jjx5HXWQfKKU0GCpkyPjfFnZefevMtGUmjjNQ==
+
 vm-browserify@0.0.4:
   version "0.0.4"
   resolved "https://registry.yarnpkg.com/vm-browserify/-/vm-browserify-0.0.4.tgz#5d7ea45bbef9e4a6ff65f95438e0a87c357d5a73"