Support for PDF viewer

[shaamcom83]

Would be good when this plugin be used for previewing and downloading pdfs as well.

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[X] Feature request
[ ] Documentation issue or request
[ ] Support request

Current behavior

Expected behavior

Minimal reproduction of the problem with instructions

My official live example on StackBlitz (based on https://stackblitz.com/edit/angular-modal-gallery-v7) is:

What is the motivation / use case for changing the behavior?

Environment (the most important section to fill very carefully)

- @ks89/angular-modal-gallery version: X.X.X
- Node version: X.X.X  
- npm version: X.X.X  
- Operating System and version:  
- Angular version: X.Y.Z 
- angular-cli version (or SystemJS/Webpack): X.Y.Z 
- I'm using Server Side Rendering with angular-universal: YES/NO
- I'm compiling with mode: DEBUG / PROD / PROD with AOT



Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX

Others:

[Ks89]

Hi!
Honestly I'm not an expert about PDFViewer and how to integrate it into a <div>.

The best way to do this is probably start experimenting a cross browser way to show PDFs in a div with fixed width and height and then try to merge it into the library.

To do this I need help, so a repo with some working examples supporting browsers >= IE11.
Then, if the result is good, I can try to merge it into the library.

I cannot set high priority to this, because I already scheduled the todo list for version 8.0.0.

Would you contribute to this?