Create Issue Template

Creates Issue Template to avoid issues or requests related to the CloudNativePG Docs. Based on issue #373

Author: FloorD

.github/ISSUE_TEMPLATE/issue-template.md

@@ -0,0 +1,11 @@
+---
+name: Issue template
+about: 'Issue template for cloudnative-pg.io '
+title: Issue cloudnative-pg website
+labels: ''
+assignees: ''
+
+---
+
+*Please read and take into consideration the following:*
+- This repository is not the place for issues or requests related to the CloudNativePG documentation. For Docs, instead go to the [main project](https://github.com/cloudnative-pg/cloudnative-pg) and follow the [instructions](https://github.com/cloudnative-pg/cloudnative-pg/tree/main/docs).