API to add multiple files to same zip.

[Sourabh-Pandit]

As of now we 2 apis to compress the file/s, one compress a single file and other compress list of files. There may be a situation, where in we need to add more files to existing zip file. as of now we dont have any such api to append the existing zip file.
I have added 2 APIs in the JLCompress to address the use case stated here.
But the quick fix would be to open a zipfile with mode QuaZip::mdAdd instead of QuaZip::mdCreate.

Thanks,
S.P

[stachenov]

A quick fix is not a very good idea because it's changing behavior of the existing API.

Adding new API is a good idea. Submit a PR if you'd like the fix to be publicly available.

[Sourabh-Pandit]

Thanks, I will submit a PR

[Neustradamus]

@Sourabh-Pandit: Have you done a PR?

[Sourabh-Pandit]

No I couldnt do the PR, had some issue from my side. then I forgot about it