Add config info to readme

README.md

@@ -1,3 +1,30 @@
+# Intro
+
+This repo contains 'cmd-admission-webhook-k8s' an application thar registers the Network Service Mesh
+`Mutatingwebhookconfigurations` and responds to mutation requests.
+
+# Usage
+
+## Environment config
+
+`cmd-admission-webhook-k8s` accept following environment variables:
+
+| Variable | Type | Default | Description |
+| -------- | ---- | ------- | ----------- |
+| NSM_NAME | string | `admission-webhook-k8s` | Name of current admission webhook instance |
+| NSM_SERVICE_NAME | string | `default` | Name of service that related to this admission webhook instance |
+| NSM_NAMESPACE | string | `default` | Namespace where admission webhook is deployed |
+| NSM_ANNOTATION | string | `networkservicemesh.io` | Name of annotation that means that the resource can be handled by admission-webhook |
+| NSM_LABELS | map[string]string | | Map of labels and their values to be appended for each deployment that has `NSM_ANNOTATION` |
+| NSM_NSURL_ENV_NAME | string | `NSM_NETWORK_SERVICES` | Name of environment variable that contains NSURL in initContainers/Containers |
+| NSM_INIT_CONTAINER_IMAGES | []string | | List of init containers to be appended for each deployment that has `NSM_ANNOTATION` |
+| NSM_CONTAINER_IMAGES | []string | | List of containers to be appended for each deployment that has `NSM_ANNOTATION` |
+| NSM_ENVS | []string | | Additional environment variables to be appended to each appeded container and init container |
+| NSM_CERT_FILE_PATH | string | | Path to certificate |
+| NSM_KEY_FILE_PATH | string | | Path to RSA/Ed25519 related to `NSM_CERT_FILE_PATH` |
+| NSM_CA_BUNDLE_FILE_PATH | string | | Path to cabundle file related to `NSM_CERT_FILE_PATH` |
+| NSM_OPEN_TELEMETRY_ENDPOINT | string | `otel-collector.observability.svc.cluster.local:4317` | OpenTelemetry Collector Endpoint |
+
 # Build
 
 ## Build cmd binary locally