Add performance specs for DData

[Horusiath]

In order to make full release of DData, we need some performance measurements for things like:

• How many Get requests/sec are we able to execute in cluster of different size?
  1. We probably need to have configurable number of cluster nodes i.e. 3, 15, 40?
  2. We also will need to have a variadic number of read consistency over nodes (ReadLocal, ReadFrom(X), ReadAll).
  3. We should compare sending requests over different number of keys ie. 50 000 Gets over 1/10/100/1000 keys.
• Same thing as above but with Update and variadic write consistency.