Add README.md

Author: joelanford

README.md

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+# kubectl operator
+
+`kubectl operator` is a kubectl plugin that functions as a package manager
+for Operators in your cluster. It simplifies adding and removing Operator
+catalogs, and it has familiar commands for installing, uninstalling, and
+listing available and installed Operators.
+
+
+> **NOTE**: This plugin requires Operator Lifecycle Manager to be installed in your
+cluster. See the OLM installation instructions [here](https://olm.operatorframework.io/docs/getting-started/)
+
+## Demo
+
+![asciicast](assets/asciinema-demo.gif)
+