Write doc section: Xvc for DVC Users

[Emre Sahin]

What are the similarities?

• Purpose
• Git

What are the differences?

• No extra files in the workspace
• Pipelines are not defined with YAML
• CLI is different (dvc add -> xvc file track ...)
• Some concepts are named differently (pipeline stages -> steps, remotes -> storages)

What's missing from DVC?

• More dependency types
• Ability to run pipeline elements in parallel
• Possibly different digest algorithms
• Possible to have different cache-types for different files

What's missing from Xvc?

• experiments

[Emre Sahin]

Closed by #181