Add search in pdf viewer

[maximeburri]

[maximeburri]

PDFViewer doesn't accept option for searchbar : DImuthuUpe/AndroidPdfViewer#55

Maybe see pdf.js hosted in server : https://github.com/mozilla/pdf.js
This solution would (not sure) delete the downloading of pdfs, the viewer directly embed on click. The devices will always be connected to the LAN with the server to see pdfs.