Example
Badges are numerical indicators of how many items are associated with a link:
Use the .badge class within <span> elements to create badges:
<a href="#">News <span class="badge">5</span></a><br>
<a href="#">Comments <span class="badge">10</span></a><br>
<a href="#">Updates <span class="badge">2</span></a
Badge in Button
<button type="button" class="btn btn-primary">Primary <span class="badge">7</span></button>
