Add github issue template for flaky specs

.github/ISSUE_TEMPLATE/flakies.md

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+# What
+Tests that fail randomly are called "flakies", this one seems to be one:
+
+**Randomized seed:** FILL_WITH_RANDOM_SEED
+
+**Failure:**
+
+```
+  FILL_WITH_FAILURE_REPORT
+```
+
+# How
+- [ ] Explain why the test is flaky, or under which conditions/scenario it fails randomly
+- [ ] Explain why your PR fixes it
+
+## Tips for flaky hunting
+
+### Random values issues
+If the problem comes from randomly generated values, running multiple times a single spec could help you reproduce the failure by running at your command line:
+```bash
+for run in {1..10}
+do
+  bin/rspec ./spec/features/budgets/investments_spec.rb:256
+done
+```
+
+You can also try running a single spec in Travis:
+Add option `:focus` to the spec and push your branch to Github, for example:
+```ruby
+scenario 'Show', :focus do
+```
+
+But remember to remove that `:focus` changes afterwards when submitting your PR changes!
+
+### Test order issues
+Running specs in the order they failed may discover that the problem is that a previous test sets an state in the test environment that makes our flaky fail/pass. Tests should be independent from the rest.
+
+After executing rspec you can see the seed used, add it as an option to rspec, for example:
+`bin/rspec --seed 55638` (check **Randomized seed** value at beginning of issue)
+
+### Other things to watch for
+- Time related issues (current time, two time or date comparisons with miliseconds/time when its not needed)
+- https://semaphoreci.com/community/tutorials/how-to-deal-with-and-eliminate-flaky-tests