Add Flower Baseline: Ditto about flower HOT 4 OPEN

Hi @jafermarq , The reproduction of Ditto is going well, but I have a couple of sticking points that I was hoping you could advise on... From the paper <https://arxiv.org/abs/2012.04221> + repo <https://github.com/litian96/ditto>, they don't seem to provide some of hyperparameters used to achieve the reported results, specifically: - Whether the stated learning rate applies to the local and global objectives, in relation to Algorithm 2. - The number of clients selected for each round of training. - The number of local iterations to update the global and personalised parameters. With this in mind, what level of result reproduction do you expect? Further, would it be acceptable, for the contribution, to only replicate a subset of the results. i.e. the 'clean' tests without clients acting maliciously? Thanks!