Added new Gitlab issue template file for objective-based product changes

.gitlab/issue_templates/product-change.md

@@ -0,0 +1,27 @@
+### Target problem
+
+(Describe the target persona (user or business), and the problem that the change is aimed to improve)
+
+### Hypothesis
+
+(Describe the propoosed change and how it relates to the target problem)
+
+### What is the primary metric that this change is aimed to improve?
+
+(Metric, KPI, and how it can be monitored)
+
+### What is the current state of this metric, and what is the improvement goal?
+
+(Current value of the metric, target value of the metric)
+
+### How does this change affect the desired metric?
+
+(Explain how the proposed change relates to the metric)
+
+### What counter metric will ensure that an increase in the primary metric is a positive for the product?
+
+(Metric, KPI, and how it can be monitored)
+
+### Size estimate
+
+(Size estimate -- from Design + Dev -- required to deliver this change. Is just an estimate)