Update charter/packages/opa-gatekeeper/Architecture.md

Deleted charter/packages/opa-gatekeeper/.gitkeep

charter/packages/opa-gatekeeper/Architecture.md

+# OPA-Gatekeeper
+
+## Overview
+
+Gatekeeper is an auditing tool that allows administrators to see what resources are currently violating any given policy.
+
+## Big Bang Touchpoints
+
+```mermaid
+graph LR
+  subgraph "OPA Gatekeeper"
+    collector("Collector") --> auditor{{Auditor}}
+  end      
+
+  subgraph "Metrics"
+    auditor{{Auditor}} --> metrics("Metrics")
+  end
+
+  subgraph "Kubernetes API"
+    api("Kubernetes API") --> collector("Collector")
+    auditor{{Auditor}} --> api("Kubernetes API")
+  end
+
+  subgraph "kubectl"
+    ctl("kubectl") --> api("Kubernetes API")
+  end
+
+```
+
+### Storage
+
+Data from gatekeeper is not stored is provided via [metrics](https://open-policy-agent.github.io/gatekeeper/website/docs/metrics/).
+
+### Database
+
+Gatekeeper doesn't have a database.
+
+### Istio Configuration
+
+This package has no specific istio configuration.
+
+## High Availability
+
+High availability is accomplished by increasing the replicas in the values file of this helm chart.
+
+## Single Sign on (SSO)
+
+None. This service doesn't have a web interface.
+
+## Licencing
+
+[Apache License](https://github.com/open-policy-agent/gatekeeper/blob/master/LICENSE)
+
+## Dependencies
+
+None.