tool: validator script for Azure NPM to Cilium migration

tools/azure-npm-to-cilium-validator/README.md

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+# Azure NPM to Cilium Validator
+
+This tool validates the migration from Azure NPM to Cilium. It will provide information on if you can safely proceed with a manual update from Azure NPM to Cilium. It will verify the following checks to determine if the cluster is safe to migrate.
+
+- NetworkPolicy with endPort
+- NetworkPolicy with ipBlock
+- NetworkPolicy with Egress Policies (not Allow All)
+- Disruption for some Services (LoadBalancer or NodePort) with externalTrafficPolicy=Cluster
+
+## Prerequisites
+
+- Go 1.16 or later
+- A Kubernetes cluster with Azure NPM installed
+
+## Installation
+
+Clone the repository and navigate to the tool directory:
+
+```bash
+git clone https://github.com/Azure/azure-container-networking.git
+cd azure-container-networking/tools/azure-npm-to-cilium-validator
+```
+
+## Setting Up Dependencies
+
+Initialize the Go module and download dependencies:
+
+```bash
+go mod tidy
+go mod vendor
+```
+
+## Running the Tool
+
+Run the following command with the path to your kube config file with the cluster you want to validate.
+
+```bash
+go run azure-npm-to-cilium-validator.go --kubeconfig ~/.kube/config
+```
+
+This will execute the validator and print the migration summary.
+
+## Running Tests
+
+To run the tests for the Azure NPM to Cilium Validator, use the following command in the azure-npm-to-cilium-validator directory:
+
+```bash
+go test .
+```
+
+This will execute all the test files in azure-npm-to-cilium-validator_test.go and provide a summary of the test results.