Added github issue templates

Author: nosan

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Asking for help
+    url: https://stackoverflow.com/tags/spring-boot
+    about: The Spring Boot team is using StackOverflow for general questions.

.github/ISSUE_TEMPLATE.md renamed to .github/ISSUE_TEMPLATE/issue.md

@@ -1,3 +1,11 @@
+---
+name: Issue
+about: Bugs, enhancements, documentation, tasks.
+title: ''
+labels: ''
+assignees: ''
+---
+
 <!--
 Thanks for raising a Spring Boot issue. Please take the time to review the following
 categories as some of them do not apply here.

SECURITY.md

@@ -0,0 +1,5 @@
+# Reporting a Vulnerability
+
+Please, [open a draft security advisory](https://github.com/spring-projects/security-advisories/security/advisories/new) if you need to disclose and discuss a security issue in private with the Spring Boot team. Note that we only accept reports against [supported versions](https://spring.io/projects/spring-boot#support).
+
+For more details, check out our [security policy](https://spring.io/security-policy).