Add README.md

Author: akalp

README.md

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+### How to use bs5-nav-tree v0.2
+#### Initializing the tree
+1. Make sure you have a list object with id "nav-tree" like ``<ul id="nav-tree"></ul>`` and, all list items must have its own id like ``<li id="li1"></li>``.  If you want to search on tree add "data-searchable" attribute to the list, and if you want to show empty groups after search add "data-show-empty-groups" attribute to the list.
+   
+   For example:
+    ```html
+    <ul id="nav-tree" data-searchable data-show-empty-groups>
+      <li id="li8">
+        <a>
+          Collapse 3
+        </a>
+        <ul>
+          <li id="li9">
+            <a href="#">
+              Link 4
+            </a>
+          </li>
+          <li id="li10">
+            <a href="#">
+              Link 5
+            </a>
+          </li>
+        </ul>
+      </li>
+    </ul>
+    ```
+2. Add this to your js file:
+   ```js
+   const nav = new NavTree({ obj_id: "#nav-tree" });
+   ```
+
+#### Updating the tree
+```js
+nav.update(menu_html);
+```
+
+### How to use bs5-nav-tree v0.1
+__This is a very primitive version, so I do NOT recommend using it.__ But you want to use it:
+#### Initializing the tree 
+1. Make sure you have a list object with id "menu-tree". All elements of the list must have an id. If you want to search on tree add "searchable" attribute to the list, and if you want to show empty groups after search add "show-empty" attribute to the list. 
+   
+   For example:
+    ```html
+    <ul id="menu-tree" searchable show-empty>
+      <li id="li8">
+        <a id="a8">
+          Collapse 3
+        </a>
+        <ul id="ul3">
+          <li id="li9">
+            <a id="a9" href="#">
+              Link 4
+            </a>
+          </li>
+          <li id="li10">
+            <a id="a10" href="#">
+              Link 5
+            </a>
+          </li>
+        </ul>
+      </li>
+    </ul>
+    ```
+
+1. Add this to your js file:
+    ```js
+    let menu = document.querySelector('#menu-tree');
+
+    init_tree(menu);
+
+    if (menu.getAttribute("searchable") !== null) {
+      menu.parentElement.prepend(htmlToElement(searchInput));
+
+      init_search(menu.getAttribute("show-empty") !== null);
+    }
+    ```
+#### Updating the tree
+```js
+ update_tree(menu, menu_html)
+```
+