create README file

Author: ofekshenawa

README.md

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+# Redis-stack helm chart
+## Installation
+
+To install the helm chart with latest images, run:
+
+```bash
+helm install redis-stack charts/redis-stack --values charts/redis-stack/values.yaml
+```
+
+To install the helm chart with redis 7.0.0-RC5, run:
+
+```bash
+helm install redis-stack charts/redis-stack --values charts/redis-stack/values_700-RC5.yaml
+```
+
+To install the helm chart with redis 6.2.2-v4, run:
+
+```bash
+helm install redis-stack charts/redis-stack --values charts/redis-stack/values_622-v4.yaml
+```
+
+## Usage
+
+To connect to redis-cli run:
+
+```bash
+kubectl get pods -o name | grep redis-stack
+```
+
+Copy the name of the pod (E.g. redis-stack-77d596476d-6j4d2) and run the following command:
+
+```bash
+kubectl exec -it <POD_NAME> -- redis-cli
+```