Document shard snapshot API

[timvisee]

Since Qdrant v1.5.0 we have a new API for shard snapshots.

It differs from regular collection snapshots and is quite an advanced topic.

There is currently no documentation on this, and we should add it.

It is probably on us three to provide this: @ffuugoo @generall @timvisee

[davidmyriel]

Please provide rough info. No need for detailed paragraphs, as long as its technically correct - ill make it into instructions.

[generall]

https://qdrant.tech/documentation/tutorials/create-snapshot/

[timvisee]

@generall this issue is about shard snapshots specifically, which is not described in our documentation.