Add Travis_CI_tests_are_failing.md (#1499)

* Add Travis_CI_tests_are_failing.md

* Update Travis_CI_tests_are_failing.md

Author: cclauss

Travis_CI_tests_are_failing.md

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+# Travis CI test are failing
+### How do I find out what is wrong with my pull request?
+1. In your PR look for the failing test and click the `Details` link: ![Travis_CI_fail_1.png](images/Travis_CI_fail_1.png)
+2. On the next page, click `The build failed` link: ![Travis_CI_fail_2.png](images/Travis_CI_fail_2.png)
+3. Now scroll down and look for `red` text describing the error(s) in the test log.
+
+Pull requests will __not__ be merged if the Travis CI tests are failing.
+
+If anything is unclear, please read through [CONTRIBUTING.md](CONTRIBUTING.md) and attempt to run the failing tests on your computer before asking for assistance.