Updates to Pull Request Template (#324)

* Update PR template

* Clarify

* add line break

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,16 +1,22 @@
 ### Description:
 
-Add description here.
+Add a short description of the check here. Link any github issues associated with this PR.
 
 ### Potential Impact:
 
-List potential impact to downstream libraries here (ex. atlas-checks, atlas-generator)
+List potential impact to downstream libraries here (ex. atlas-checks, atlas-generator).
 
 ### Unit Test Approach:
 
-Describe unit tests being added with that PR.
+Describe unit tests being added with this PR.
 
 ### Test Results:
 
-Describe other (non-unit) test results here.
+Describe other (non-unit) test results here. In case of a new check or enhancements to existing 
+checks, please add details on how many countries the check was tested on,
+total flag counts, FP rate etc. (see below example).
+
+| ISO | Total Flags | Sampled  | Sampling % | TP | FP | False Positive Rate |
+|-----|-------------|----------|------------|----|----| ------------------- |
+|  ARE   |    109         |    33      |     30%       |   24 |   9 | 27%   |