Add Unit / Integration tests (#39)

* Disable drag and drop for specific node.

Remove dependency on `user`

* Update README.md

* Update package.json

* Add testing

* Item-based style

* Updated documentation

Author: geekhybrid

.github/workflows/main

@@ -92,6 +92,7 @@ export interface TreeViewItem {
   expanded?: boolean;
   disableDragAndDrop?: boolean; // Disable drag and drop for a specific node.
   disabled?: boolean;// When disabled, an item can neither be selected nor checked
+  styles?: string[]; // Add the .css styles for a given item
   meta?: any;// provides meta-data of any type per node.
 }
 ```

.github/workflows/npm-publish.yml

@@ -119,4 +119,13 @@ button {
   background: blue !important;
 }
 
+.red-background {
+  background: black !important;
+  color: white;
+}
+
+.bold-font {
+  font-weight: bold !important;
+}
+
 </style>

README.md

@@ -2,6 +2,7 @@
   {
     "name": "Rejection Emails",
     "type": "emails",
+    "styles": ["red-background", "bold-font"],
     "expanded": true,
     "children": [
       {