update

Author: Zhang Jun

.gitignore

@@ -0,0 +1 @@
+TODO

apimachinery/meta.md

@@ -0,0 +1,12 @@
+
+``` go
+// 来源于 k8s.io/client-go/tools/cache/index.go
+// MetaNamespaceIndexFunc is a default index function that indexes based on an object's namespace
+func MetaNamespaceIndexFunc(obj interface{}) ([]string, error) {
+	meta, err := meta.Accessor(obj)
+	if err != nil {
+		return []string{""}, fmt.Errorf("object has no meta: %v", err)
+	}
+	return []string{meta.GetNamespace()}, nil
+}
+```