add basic info to readme
Created by: tgrego
Description
The README.md is a bit dull, add some basic info.
Use case
Added some basic info just like the other ensembl APIs
Benefits
Basic info about the API, specially how to contact us.
Possible Drawbacks
If applicable, describe any possible undesirable consequence of the changes. none
Testing
Have you added/modified unit tests to test the changes? no
If so, do the tests pass/fail?
Have you run the entire test suite and no regression was detected?