[Feature] Task File Share

[h4]

Hi!

As mentioned in #65 and a small per Task file share would be very nice to have.
#105 also mentions that some prerequisites for this are already met.

Unfortunately I have no experience in typescript and usually I am more of a backend kind of person ^^'.
So I am opening this feature request for someone to maybe implement any time in the future.

Greetings
h4

[JJ-8]

We already have a discussion about this: #96
But it is indeed a nice feature, but a bit difficult to implement. Hopefully Hedgedoc 2 will provide file upload at some point.