add cops

charts/cops/README.md

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+## Introduction
+
+[Calibre OPDS (and HTML) PHP Server](https://github.com/seblucas/cops)
+
+COPS's main advantages are :
+
+ - No need for many dependencies.
+ - No need for a lot of CPU or RAM.
+ - Not much code.
+ - Search is available.
+ - It was fun to code.
+
+This chart bootstraps a [COPS](https://github.com/seblucas/cops) deployment on a [Kubernetes](https://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.
+
+## Prerequisites
+
+- Kubernetes
+- Helm
+
+## Parameters
+
+See the [values files](values.yaml).