Add GitHub Issue Templates

Closes gh-1618

Author: rwinch

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,24 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'type: bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Sample**
+
+A link to a GitHub repository with a [minimal, reproducible sample](https://stackoverflow.com/help/minimal-reproducible-example).
+
+Reports that include a sample will take priority over reports that do not.
+At times, we may require a sample, so it is good to try and include a sample up front.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Community Support
+    url: https://stackoverflow.com/questions/tagged/spring-security
+    about: Please ask and answer questions on StackOverflow with the tag spring-session

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,25 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'type: enhancement'
+assignees: ''
+
+---
+
+**Expected Behavior**
+
+<!--- Tell us how it should work -->
+
+**Current Behavior**
+
+<!--- Explain the difference from current behavior -->
+
+**Context**
+
+<!--- 
+How has this issue affected you?
+What are you trying to accomplish?
+What other alternatives have you considered?
+Are you aware of any workarounds?
+-->

.github/ISSUE_TEMPLATE/feature_request.md

@@ -3,5 +3,7 @@ For Security Vulnerabilities, please use https://pivotal.io/security#reporting
 -->
 
 <!--
-Thanks for contributing to Spring Session. Please provide a brief description of your pull-request and reference any related issue numbers (prefix references with #).
+Before creating new features, we recommend creating an issue to discuss the feature. This ensures that everyone is on the same page before extensive work is done.
+
+Thanks for contributing to Spring Security. Please provide a brief description of your pull-request and reference any related issue numbers (prefix references with gh-).
 -->