Initial v1.0.0 commit

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug Report
+about: Report a bug encountered while working with this Gardener extension
+labels: kind/bug
+
+---
+
+**How to categorize this issue?**
+<!--
+Please select area, kind, and priority for this issue. This helps the community categorizing it.
+Replace below TODOs or exchange the existing identifiers with those that fit best in your opinion.
+If multiple identifiers make sense you can also state the commands multiple times, e.g.
+  /area control-plane
+  /area auto-scaling
+  ...
+
+"/area" identifiers:     audit-logging|auto-scaling|backup|certification|control-plane-migration|control-plane|cost|delivery|dev-productivity|disaster-recovery|documentation|high-availability|logging|metering|monitoring|networking|open-source|operations|ops-productivity|os|performance|quality|robustness|scalability|security|storage|testing|usability|user-management
+"/kind" identifiers:     api-change|bug|cleanup|discussion|enhancement|epic|impediment|poc|post-mortem|question|regression|task|technical-debt|test
+"/priority" identifiers: normal|critical|blocker
+-->
+/area TODO
+/kind bug
+/priority normal
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+
+- Gardener version (if relevant):
+- Extension version:
+- Kubernetes version (use `kubectl version`):
+- Cloud provider or hardware configuration:
+- Others: