Update documentation, create two bricks to use in gluster.cluster

[mykaul]

I actually liked the fact the documentation/examples were more comprehensive and have shown how to create thick and thin LVs. Why reduce it?

[sac]

I actually liked the fact the documentation/examples were more comprehensive and have shown how to create thick and thin LVs. Why reduce it?

This reduction was done to maintain continuity with gluster.cluster. This role creates two bricks, and the gluster.cluster role creates volume using these bricks. If someone would like to follow these examples, they could create end-to-end deployment looking up the Readme.md