Add compatibility request issue template. (#79)

.github/ISSUE_TEMPLATE/compatibility_request.md

@@ -0,0 +1,23 @@
+---
+name: Compatibility request
+about: Suggest supporting a new version of OpenSearch
+title: 'Compatibility with OpenSearch (version)'
+labels: compatibility, level/task, type/research
+assignees: ''
+
+---
+
+## Description
+We need to ensure the compatibility with the next version of OpenSearch vX.X.
+This update is still being discussed, but we need to be aware of potential issues.
+
+For that, we need to:
+
+- [ ] Review opensearch's release notes.
+- [ ] Identify improvements and potential impact.
+- [ ] Create new development branch.
+- [ ] Develop a testing environment to verify our components would work under this new build.
+
+
+## Issues
+-  _List here the detected issues_