The DevStack documentation should provide basic steps for setting up
Watcher with DevStack assuming the reader has no previous knowledge of
DevStack.
Change-Id: I830b1d9accb0e65bba73944697cba9c53ac3263e
Closes-Bug: #1538291
Change the title of the page.
Create a 'Getting Started' section.
Create a 'Plugins' section.
Add links to related source code repositories.
Fix bad link to watcher client installation doc.
Change-Id: Ie0548149751d53b5fca235da69798dd0d333b14c
Partial-Bug: #1535244