Add User guide for how to handle the violations (#920)

security_test/README.md

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+# Shipshape Validation Service - User Guide
+
+## Overview
+The Shipshape Validation Service validates Kubernetes YAML configurations against predefined security policies. This ensures compliance and enhances the security of Kubernetes deployments.
+
+If your e2e test fails due to a policy violation detected by Shipshape, you have two options:
+1. **Fix the Code**: Resolve the violation by modifying the code to comply with the specified policy. You may consult the GKE Hardening team for guidance.
+2. **Add to Allowlist**: If the violation is a known exception, you can add it to the allowlist to prevent it from blocking your build.
+
+---
+
+## Example Violation
+
+**Violation:**
+```json
+{
+    "details": {
+        "@type": "type.googleapis.com/google.internal.kubernetes.security.validation.v1.ContainerDetails",
+        "containerName": "kuberay-tpu-webhook"
+    },
+    "message": "container \"kuberay-tpu-webhook\" in Deployment \"kuberay-tpu-webhook\" does not set readOnlyRootFilesystem: true in its securityContext. This setting is encouraged because it can prevent attackers from writing malicious binaries into runnable locations in the container filesystem.",
+    "policyName": "readonlyrootfs",
+    "resourceKey": {
+        "group": "apps",
+        "kind": "Deployment",
+        "name": "kuberay-tpu-webhook",
+        "namespace": "ray-system",
+        "version": "v1"
+    }
+}
+```
+## Steps to Address the Violation
+
+### Option 1: Fix the Code
+1. Identify the root cause of the violation from the validation output.
+2. Update the Kubernetes YAML or Helm chart to comply with the security policy. For example, in the above violation:
+    - Add the following snippet under `securityContext` for the `kuberay-tpu-webhook` yaml:
+      ```yaml
+      securityContext:
+        readOnlyRootFilesystem: true
+      ```
+3. Run the e2e test again to confirm the issue is resolved.
+4. For further assistance, reach out to the **GKE Hardening team**.
+
+---
+
+### Option 2: Add to Allowlist
+If the violation is a known exception, you can add it to the allowlist:
+
+1. **Locate the Allowlist Directory**:  
+   Navigate to the directory:
+   ```bash
+   security_test/allowlist/category
+   ```
+2. Create a JSON File
+
+3. Use the policy name from the violation (`readonlyrootfs`) as the filename.
+    - Example: `readonlyrootfs.json`
+
+4. **Add the Allowlist Entry**:  
+   Populate the JSON file with the relevant details from the violation. For the above example, please only change the message part:
+
+   ```json
+    [
+        {
+            "details": {
+                "@type": "type.googleapis.com/google.internal.kubernetes.security.validation.v1.ContainerDetails",
+                "containerName": "kuberay-tpu-webhook"
+            },
+            "policyName": "readonlyrootfs",
+            "resource": {
+                "group": "apps",
+                "kind": "Deployment",
+                "name": "kuberay-tpu-webhook",
+                "namespace": "ray-system",
+                "version": "v1"
+            },
+            "message": "Known exception for the kuberay-tpu-webhook component."
+        }
+    ]
+   ```
+
+### Additional Notes
+
+- Always prioritize fixing code violations whenever feasible.
+- Use the allowlist option sparingly and only for documented exceptions.
+- For further queries or support, contact the **GKE Hardening team**.