* There was too much of information in the README.rst which was
redundant. So, added some useful links in the file and removed
redundant information.
* Added the debug_guide which provides some brief information
about the debugging of mistral.
Change-Id: I9d3505864bec6b7ae4e4b2c386a98fd5a808564a
Partial-Implements: blueprint mistral-doc
Implements: blueprint mistral-docs-troubleshooting