[vault-unseal] Add README.md

Signed-off-by: babykart <[email protected]>

README.md

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+# vault-unseal
+
+[![License](https://img.shields.io/badge/License-MIT-blue)](https://opensource.org/licenses/MIT)
+[![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/vault-unseal)](https://artifacthub.io/packages/search?repo=vault-unseal)
+
+## Usage
+
+[Helm](https://helm.sh) must be installed to use the charts. Please refer to
+Helm's [documentation](https://helm.sh/docs) to get started.
+
+Once Helm has been set up correctly, add the repo as follows:
+
+```sh
+helm repo add vault-unseal https://babykart.github.io/vault-unseal
+```
+
+If you had already added this repo earlier, run `helm repo update` to retrieve
+the latest versions of the packages. You can then run `helm search repo
+vault-unseal` to see the charts.
+
+To install the vault-unseal chart:
+
+```sh
+helm upgrade --install vault-unseal vault-unseal/vault-unseal
+```
+
+Using an OCI-based registry:
+
+```sh
+helm upgrade --install oci://ghcr.io/babykart/helm-charts/vault-unseal --version <version>
+ ```
+
+To uninstall the chart:
+
+```sh
+helm delete vault-unseal
+```