Rewrite ingress-gce general documentation

[nicksardo]

TODO: Rewrite README.md emphasizing on the features this controller does support and provide links to the appropriate example directories.

[leedsjb]

Please note the file ingress-app.yaml referenced in README.md does not exist in the repo. Please see: #150 where this file was removed.

[nicksardo]

Be sure to mention how users should configure timeouts in their applications: #245

[cceckman]

And note that the file rc.yaml listed in README.md does not exist in the repo.

[rramkumar1]

@leedsjb @cceckman Working on a fix for that. Thanks for pointing it out.

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[rramkumar1]

Closing this bug since the scope is quite broad. We will file individual issues for each docs fix.

/close

[k8s-ci-robot]

@rramkumar1: Closing this issue.

In response to this:

Closing this bug since the scope is quite broad. We will file individual issues for each docs fix.

/close

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