Implement ConfigMap Management in Helm Chart

[Razano26]

We need to manage application configuration and secrets via Kubernetes ConfigMap and Secret resources. The Helm chart should include templates for these resources and allow the configuration of environment variables and sensitive data.

Tasks:

1. Add a ConfigMap template to the Helm chart for application configuration.
2. Update the Deployment template to mount the ConfigMap as environment variables.
3. Add configurable values in values.yaml for the ConfigMap.
4. Document usage in the Helm chart's README.

Expected Outcome:

The Helm chart supports configurable ConfigMap resource, allowing dynamic configuration of the application in Kubernetes.