Minor tweaks to PR template for clarity

Request features be added to readme as well

Author: michael-hawker

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,6 @@
-## Fixes #
-<!-- Link to relevant issue (for ex: #1234) which will automatically close the issue once the PR is merged -->
+## Fixes #<!-- Link to relevant issue (for ex: #1234) which will automatically close the issue once the PR is merged -->
+
+<!-- Add a brief overview here of the feature/bug & fix -->
 
 ## PR Type
 What kind of change does this PR introduce?
@@ -20,6 +21,7 @@ What kind of change does this PR introduce?
 
 
 ## What is the new behavior?
+<!-- Describe how was this issue resolved or changed? -->
 
 
 ## PR Checklist
@@ -32,9 +34,9 @@ Please check if your PR fulfills the following requirements:
     - [ ] Icon has been created (if new sample) following the [Thumbnail Style Guide and templates](https://github.com/windows-toolkit/WindowsCommunityToolkit-design-assets)
 - [ ] Tests for the changes have been added (for bug fixes / features) (if applicable)
 - [ ] Header has been added to all new source files (run *build/UpdateHeaders.bat*)
+- [ ] If new feature, add to [Feature List](https://github.com/windows-toolkit/WindowsCommunityToolkit/blob/master/readme.md#-features)
 - [ ] Contains **NO** breaking changes
 
-
 <!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. 
      Please note that breaking changes are likely to be rejected -->