Add bug template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,32 @@
+---
+name: Bug report
+about: Report a bug encountered while running prometheus-adapter
+title: ''
+labels: kind/bug
+assignees: ''
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!
+
+If the matter is security related, please disclose it privately see https://github.com/kubernetes/kube-state-metrics/blob/master/SECURITY.md
+-->
+
+**What happened?**:
+
+**What did you expect to happen?**:
+
+**Please provide the prometheus-adapter config**:
+
+**Please provide the HPA status**:
+
+**Please provide the prometheus-adapter logs with -v=6 around the time the issue happened**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- prometheus-adapter version: 
+- prometheus version: 
+- Kubernetes version (use `kubectl version`):
+- Cloud provider or hardware configuration:
+- Other info: