Initial v1.0.0 commit

docs/usage/register_cluster.md

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+# Register Shoot cluster in Fleet manager
+
+## Introduction
+Gardener takes care of provisioning clusters. It doesn't install anything into created clusters.
+This extension enables App instalation via [Fleet](https://fleet.rancher.io) by registering newly created Shoot clusters into Fleet manager.
+
+### Service Scope
+This service enables users to register Shoot cluster in Fleet.
+```yaml
+kind: Shoot
+...
+spec:
+  extensions:
+  - type: shoot-fleet-agent
+    providerConfig:
+      apiVersion: service.fleet-agent.extensions.gardener.cloud/v1alpha1
+      kind:
+      clientConnection:
+        kubeconfig: base64 encoded kubeconfig
+      labels:
+        env: test
+```
+
+<style>
+#body-inner blockquote {
+    border: 0;
+    padding: 10px;
+    margin-top: 40px;
+    margin-bottom: 40px;
+    border-radius: 4px;
+    background-color: rgba(0,0,0,0.05);
+    box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
+    position:relative;
+    padding-left:60px;
+}
+#body-inner blockquote:before {
+    content: "!";
+    font-weight: bold;
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    left: 0;
+    background-color: #00a273;
+    color: white;
+    vertical-align: middle;
+    margin: auto;
+    width: 36px;
+    font-size: 30px;
+    text-align: center;
+}
+</style>