More documentation required about each of the various benchmark packages

[davidkel]

We need more documentation about each of the various benchmark packages that exist and what they deomonstrate. The most interesting one is the fabric-api package that looks to test fabric at an individual chaincode api level and how it actively tries to avoid MVCC_READ_CONFLICTS. This needs to be explained and guided, plus we need to ensure that this documentation is appropriately linked via the main README file.