FAQ.rst: Add item about CoC

[PrajwalM2212]

This adds Code of Conduct item to FAQ.

Closes #554

For short term contributors: we understand that getting your commits well
defined like we require is a hard task and takes some learning. If you
look to help without wanting to contribute long term there's no need
for you to learn this. Just drop us a message and we'll take care of brushing
up your stuff for merge!

Checklist

• I read the commit guidelines and I've followed
  them.
• I ran coala over my code locally. (All commits have to pass
  individually. It is not sufficient to have "fixup commits" on your PR,
  our bot will still report the issues for the previous commit.) You will
  likely receive a lot of bot comments and build failures if coala does not
  pass on every single commit!

After you submit your pull request, DO NOT click the 'Update Branch' button.
When asked for a rebase, consult coala.io/rebase
instead.

Please consider helping us by reviewing other peoples pull requests as well:

• pick up any PR at https://coala.io/review
• review it (check https://coala.io/reviewing for more info)
• if you are sure that it needs work, use corobo mark wip <URL> to get it out
  of the review queue.

The more you review, the more your score will grow at coala.io and we will
review your PRs faster!

[jayvdb]

Please dont include the entire CoC.

Only an item about the CoC, so people know we have one, and how to find it.

[TravisBuddy]

Travis tests have failed

Hey @PrajwalM2212,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

1st Build

make html SPHINXOPTS=-W

sphinx-build -b html -d _build/doctrees  -W . _build/html
Running Sphinx v1.4.9
making output directory...
loading pickled environment... not yet created
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 13 source files that are out of date
updating environment: 13 added, 0 changed, 0 removed
reading sources... [100%] index

Warning, treated as error:
/home/travis/build/coala/documentation/Help/FAQ.rst:2: WARNING: Duplicate explicit target name: "here".

make: *** [html] Error 1

[PrajwalM2212]

@jayvdb I have made the changes. I have trimmed the CoC to include only the must have details. Do tell me if I need to shorten it even more.

[jayvdb]

add space after .

[jayvdb]

avoid "here" as a link text.

[PrajwalM2212]

@jayvdb I have made the changes.

[jayvdb]

ack 08e73b5

[jayvdb]

@gitmate-bot ff

[gitmate-bot]

Hey! I'm GitMate.io! This pull request is being fastforwarded automatically. Please DO NOT push while fastforward is in progress or your changes would be lost permanently ⚠️

[gitmate-bot]

Automated fastforward with GitMate.io was successful! 🎉