fix: add lacking values docs (#484)

@witalisoft is our employee, no need for CLA

Author: witalisoft

charts/netdata/README.md

@@ -209,6 +209,10 @@ The following table lists the configurable parameters of the netdata chart and t
 | `parent.claiming.enabled`                     | Enable parent claiming for netdata cloud                                                                                                               | `false`                                                                                 |
 | `parent.claiming.token`                       | Claim token                                                                                                                                            | `""`                                                                                    |
 | `parent.claiming.room`                        | Comma separated list of claim rooms IDs                                                                                                                | `""`                                                                                    |
+| `parent.securityContext.runAsUser`            | The UID to run the container process                                                                                                                   | `201`                                                                                   |
+| `parent.securityContext.runAsGroup`           | The GID to run the container process                                                                                                                   | `201`                                                                                   |
+| `parent.securityContext.fsGroup`              | The supplementary group for setting permissions on volumes                                                                                             | `201`                                                                                   |
+| `parent.extraInitContainers`                  | Additional init containers to add to the parent pods                                                                                                   | `[]`                                                                                    |
 | `parent.extraVolumeMounts`                    | Additional volumeMounts to add to the parent pods                                                                                                      | `[]`                                                                                    |
 | `parent.extraVolumes`                         | Additional volumes to add to the parent pods                                                                                                           | `[]`                                                                                    |
 | `k8sState.hostname`                           | K8s state node hostname                                                                                                                                | `netdata-k8s-state`                                                                     |