feat: documentation for addHTML

Author: OlisaevAG

docs/usage/shared/html.md

@@ -0,0 +1,36 @@
+# HTML
+
+## HTML
+You can generate a Word file from html.
+
+``` php
+<?php
+
+  $phpWordInstance    = new PhpWord();
+  $phpSectionInstance = $phpWordInstance->addSection([
+      'orientation'  => 'landscape',
+      'marginLeft'   => (int)round(20 * 56.6929133858),
+      'marginRight'  => (int)round(20 * 56.6929133858),
+      'marginTop'    => (int)round(20 * 56.6929133858),
+      'marginBottom' => (int)round(20 * 56.6929133858),``
+  ]);
+
+  $html = '<!-- Any html. Table for example -->
+  <table>
+      <tr>``
+          <td style="border-left:solid blue 2px;">border-left:solid blue 2px;</td>
+          <td style="border-right:solid 2px red;">border-right:solid 2px red;</td>
+      </tr>
+  </table>';
+
+  $fullHTML = false;
+
+  Html::addHtml($phpSectionInstance, $html, $fullHTML, false);
+    
+  $fqName = new PhpOffice\PhpWord\Writer\Word2007($phpWordInstance);
+  $fqName->save('./test.docx');
+```
+
+$html - $html param must have root node such as "html" if it is full html;
+
+$fullHTML - If $html is not full html, it may not have a root element. In  this case $fullHTML should be false.