to view the pdf you can do it in different ways.
For example if you want the PDF to be in a new tab to your label <a>
you add the attribute "_blank" and its code would look like this:
<a target="_blank" href="{{asset('files/nombreDeTuPdf.pdf')}}">PDF</a>
If you want to see the pdf on the same page, you can do it with iframe:
<iframe width="400" height="400" src="{{asset('files/nombreDeTuPdf.pdf')}}" frameborder="0"></iframe>
If you want to be able to visualize it also on Android mobile devices you can do it using Google Drive Viewer which has the following structure (if you do not use this viewer you can only download the pdf, but do not visualize it on the same page):
<iframe src="https://docs.google.com/viewer?url=UrlDeTuPDF&embedded=true" frameborder="0"></iframe>
For example:
<iframe width="400" height="400" src="https://docs.google.com/viewer?url=http://unec.edu.az/application/uploads/2014/12/pdf-sample.pdf&embedded=true" frameborder="0"></iframe>