add issue policies doc to issue template (#17871)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -4,6 +4,9 @@ about: Create a report about something that is not working
 ---
 
 <!--
+
+More information on our issue management policies can be found here: https://aka.ms/aspnet/issue-policies
+
 Please keep in mind that the GitHub issue tracker is not intended as a general support forum, but for reporting non-security bugs and feature requests.
 
 If you believe you have an issue that affects the SECURITY of the platform, please do NOT create an issue and instead email your issue details to [email protected]. Your report may be eligible for our [bug bounty](https://www.microsoft.com/en-us/msrc/bounty-dot-net-core) but ONLY if it is reported through email.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -3,6 +3,12 @@ name: Feature request
 about: Suggest an idea for this project
 ---
 
+<!--
+
+More information on our issue management policies can be found here: https://aka.ms/aspnet/issue-policies
+
+-->
+
 ### Is your feature request related to a problem? Please describe.
 A clear and concise description of what the problem is.
 Example: I am trying to do [...] but [...]