adding ClusterComplianceReport documentation, closing aquasecurity#1101

docs/tutorials/creating-custom-compliance-report.md

@@ -0,0 +1,87 @@
+# Creating Custom Compliance Reports
+
+With the release of the NSA compliance reports, we have added the capability to create any type of report. You can find an example of a the `ClusterComplianceReport` in the [documentation](../crds/clustercompliance-report.md)
+
+Otherwise, access the `ClusterComplianceReport` directly through your Kubernetes cluster by following the steps outlined below:
+
+1. [Install the Starboard Operator](../operator/installation/helm.md) inside of your Kubernetes cluster
+2. Wait a few minutes to allow the operator to generate all the reports
+3. Run the following command to access the `ClusterComplianceReport`
+
+    ```
+    kubectl describe ClusterComplianceReport nsa
+    ```
+
+The report has two main sections: 
+
+- spec: represents the NSA compliance control checks specification, check details, and the mapping to the security scanner
+- status: represents the NSA compliance control checks results
+
+We can customize the `Spec` by amending the control checks severity or cron expression to then generate a custom status output within the ClusterComplianceReport  CRD.
+First, we are going to open the CRD in edit mode. This can be done with the following command:
+
+```
+kubectl edit compliance
+```
+
+Let's look at one of the scans within the `Spec` section:
+```
+ 22   controls:
+ 23   - description: Check that container is not running as root
+ 24     id: "1.0"
+ 25     kinds:
+ 26     - Workload
+ 27     mapping:
+ 28       checks:
+ 29       - id: KSV012
+ 30       scanner: config-audit
+ 31     name: Non-root containers
+ 32     severity: MEDIUM
+```
+
+You can find the whole list of controls used within the `ClusterComplianceReport` in the specification.
+Currently, we can run two types of scans, namely `config-audit` and `kube-bench`. 
+
+
+Change any of the severity within the ClusterComplianceReport and then close the editor through `:wq`:
+```
+ 22   controls:
+ 23   - description: Check that container is not running as root
+ 24     id: "1.0"
+ 25     kinds:
+ 26     - Workload
+ 27     mapping:
+ 28       checks:
+ 29       - id: KSV012
+ 30       scanner: config-audit
+ 31     name: Non-root containers
+ 32     severity: HIGH
+
+```
+
+
+This will regenerate the `status` section in accordance with the changes that you made.
+
+We can the access the compliance status report in JSON format through the following command:
+```
+kubectl get compliance nsa  -o=jsonpath='{.status}' | jq .
+{
+  "controlCheck": [
+    {
+      "description": "Control checks whether anonymous-auth is unset",
+      "failTotal": 0,
+      "id": "7.0",
+      "name": "Make sure anonymous-auth is unset",
+      "passTotal": 1,
+      "severity": "CRITICAL"
+    },
+    {
+      "description": "Controls whether containers can use the host network",
+      "failTotal": 0,
+      "id": "1.5",
+      "name": "Use the host network",
+      "passTotal": 1,
+      "severity": "HIGH"
+    },
+
+```