docs(esdoc): add esdoc config

.esdoc.json

@@ -0,0 +1,20 @@
+{
+  "source": "./src",
+  "destination": "./docs",
+  "excludes": [
+    "index\\.js"
+  ],
+  "plugins": [
+    {
+      "name": "esdoc-standard-plugin",
+      "option": {
+        "brand": {
+          "title": "o",
+          "description": "common object helper functions",
+          "repository": "https://github.com/hammy2899/o",
+          "author": "hammy2899"
+        }
+      }
+    }
+  ]
+}