Enhance README with contribution information

Add some more information on how to contribute.

Change-Id: I25250223f2960265e901912a0efe236a483a501d
Add missing parameter to example

swift-ring-builder needs an extra parameter

Change-Id: I6ee78e38c1cb19eeb963194912ef56d21fff6dd9
Closes-Bug: #1266265
Use openrc.sh instead of openrc

Use the same filename for all references to the credentials bash file.

Change-Id: I6bf1f9f318bf3f2a39c42fdbac2c400a31d4ce8a
backport: none
Renamed cli files for consistency

Updated a typo (keystone-mange -> keystone-manage)
Updated a few capitalization errors in titles

Change-Id: I38ec2a6c53b9e3a1e1bf330b54c26f293a764d94
author: diane fleming
Merge "Add missing parameter to example"
Merge "Renamed cli files for consistency"
Merge "Enhance README with contribution information"