Add missing Installation docs

manifests/cluster-role-binding.yaml

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+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: SM_CLUSTER_ROLE_BINDING_NAME
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: SM_CLUSTER_ROLE_NAME
+subjects:
+  - kind: ServiceAccount
+    name: SM_ACCOUNT_NAME
+    namespace: SM_NAMESPACE

manifests/cluster-role.yaml

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+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: SM_CLUSTER_ROLE_NAME
+rules:
+  - apiGroups: ["netcracker.com"]
+    resources: ["sitemanagers"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["netcracker.com"]
+    resources: ["sitemanagers/status"]
+    verbs: ["get", "list", "watch", "update"]
+  - apiGroups: ["qubership.org"]
+    resources: ["sitemanagers"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["qubership.org"]
+    resources: ["sitemanagers/status"]
+    verbs: ["get", "list", "watch", "update"]
+  - apiGroups: ["coordination.k8s.io"]
+    resources: ["leases"]
+    verbs: ["get", "create", "update"]
+  - apiGroups: [""]
+    resources: ["events"]
+    verbs: ["create", "patch"]
+  - apiGroups: ["authentication.k8s.io"]
+    resources: ["tokenreviews"]
+    verbs: ["create"]

manifests/crd-sitemanager.yaml

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+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    controller-gen.kubebuilder.io/version: v0.18.0
+  name: sitemanagers.qubership.org
+spec:
+  group: qubership.org
+  names:
+    kind: SiteManager
+    listKind: SiteManagerList
+    plural: sitemanagers
+    singular: sitemanager
+  scope: Namespaced
+  versions:
+  - additionalPrinterColumns:
+    - description: Service name in site-manager
+      jsonPath: .status.serviceName
+      name: SERVICE NAME
+      type: string
+    - description: The summary status of service
+      jsonPath: .status.summary
+      name: STATUS
+      type: string
+    name: v3
+    schema:
+      openAPIV3Schema:
+        description: SiteManager is the Schema for the sitemanagers API.
+        properties:
+          apiVersion:
+            description: |-
+              APIVersion defines the versioned schema of this representation of an object.
+              Servers should convert recognized schemas to the latest internal value, and
+              may reject unrecognized values.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
+            type: string
+          kind:
+            description: |-
+              Kind is a string value representing the REST resource this object represents.
+              Servers may infer this from the endpoint the client submits requests to.
+              Cannot be updated.
+              In CamelCase.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
+            type: string
+          metadata:
+            type: object
+          spec:
+            description: SiteManagerSpec defines the desired state of SiteManager.
+            properties:
+              sitemanager:
+                description: This additional "options" struct is introduced to keep
+                  backward compatibility
+                properties:
+                  after:
+                    items:
+                      type: string
+                    type: array
+                  alias:
+                    type: string
+                  allowedStandbyStateList:
+                    items:
+                      type: string
+                    type: array
+                  before:
+                    items:
+                      type: string
+                    type: array
+                  module:
+                    type: string
+                  parameters:
+                    properties:
+                      healthzEndpoint:
+                        type: string
+                      serviceEndpoint:
+                        type: string
+                    type: object
+                  sequence:
+                    items:
+                      type: string
+                    type: array
+                  timeout:
+                    format: int64
+                    type: integer
+                required:
+                - module
+                type: object
+            required:
+            - sitemanager
+            type: object
+          status:
+            description: SiteManagerStatus defines the observed state of SiteManager.
+            properties:
+              serviceName:
+                type: string
+              summary:
+                type: string
+            type: object
+        required:
+        - spec
+        type: object
+    served: true
+    storage: true
+    subresources:
+      status: {}
+---
+apiVersion: admissionregistration.k8s.io/v1
+kind: ValidatingWebhookConfiguration
+metadata:
+  name: site-manager-qubership-validating-webhook-configuration
+webhooks:
+- admissionReviewVersions:
+  - v1
+  clientConfig:
+    service:
+      name: site-manager
+      namespace: site-manager
+      path: /validate-qubership-org-v3-sitemanager
+      port: 442
+    caBundle: "<base-64-encoded-ca-bundle>"
+  failurePolicy: Fail
+  name: vsitemanager-v3.kb.io
+  rules:
+  - apiGroups:
+    - qubership.org
+    apiVersions:
+    - v3
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - sitemanagers
+  sideEffects: None