Stipulate reproducable example in issue template

Author: badeball

.github/ISSUE_TEMPLATE/default.yml

@@ -5,6 +5,12 @@ body:
     attributes:
       label: Current behavior
       description: A description including screenshots, stack traces, DEBUG logs, etc.
+      value: |
+        Make sure to read the section titled "Reduced test case" under the contributing guidelines [1]. Your
+        report should contain everything necessary in order for us to reproduce the issue. Preferably link
+        to another, minimal Git repository that illustrates the issue.
+
+        [1] https://github.com/badeball/cypress-cucumber-preprocessor/blob/master/CONTRIBUTING.md#reduced-test-case
     validations:
       required: true
   - type: textarea