Up for grabs

Saw this on a few projects and its a good idea. We get asked regularly
"whats something small I could immediately start working on without a
huge amount of knowledge". There is a new tag Up for grabs
https://github.com/EventStore/EventStore/labels/Up%20For%20Grabs this
will have small (normally at most a day or two worth of work) tasks
that are ready for doing.

We haven't settled on a contributors page yet or an official format
for these but we will.