Added an open API spec for Species Stats schema (converted automatically from a typescript file)
Added a json file containing a mapping between fields in the proposed Species Stats schema and the names of the attributes in the metadata database
Note
Didn't know where to put the files. Couldn't find any dedicated place for them; so put them in the root.
The open api spec file in the PR focuses on the schema. It does not prescribe what to do when the client sends a request with a wrong http verb, etc. Please use your own judgement to handle this as json apis normally do
Having said that, one special case that web client is interested in is that in case the genome with a given genome id is not found, the server respond with a 404 status.