feat: started articles about kubernetes security

knowledge base/kubernetes/network policies.md

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+# Network policies
+
+## Table of contents <!-- omit in toc -->
+
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## Further readings
+
+- [Kubernetes]
+- [Security]
+- [Kubernetes network policy recipes]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- [Network policies]
+- [Declare a network policy]
+- [An introduction to Kubernetes network policies for security people]
+- [Get started with Kubernetes network policy]
+- [Implementing Kubernetes network policies: a comprehensive guide]
+- [Setting up Kubernetes network policies: a detailed guide]
+
+<!--
+  References
+  -->
+
+<!-- Upstream -->
+[declare a network policy]: https://kubernetes.io/docs/tasks/administer-cluster/declare-network-policy/
+[network policies]: https://kubernetes.io/docs/concepts/services-networking/network-policies/
+
+<!-- In-article sections -->
+[further readings]: #further-readings
+
+<!-- Knowledge base -->
+[kubernetes]: README.md
+[security]: security.md
+
+<!-- Others -->
+[an introduction to kubernetes network policies for security people]: https://reuvenharrison.medium.com/an-introduction-to-kubernetes-network-policies-for-security-people-ba92dd4c809d
+[get started with kubernetes network policy]: https://docs.tigera.io/calico/latest/network-policy/get-started/kubernetes-policy/kubernetes-network-policy
+[implementing kubernetes network policies: a comprehensive guide]: https://blog.kubesimplify.com/implementing-kubernetes-network-policies-a-comprehensive-guide
+[kubernetes network policy recipes]: https://github.com/ahmetb/kubernetes-network-policy-recipes
+[setting up kubernetes network policies: a detailed guide]: https://www.cncf.io/blog/2019/04/19/setting-up-kubernetes-network-policies-a-detailed-guide/

knowledge base/kubernetes/security.md

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+# Security
+
+## Table of contents <!-- omit in toc -->
+
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## Further readings
+
+- [Kubernetes]
+- [Network policies]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- [Canals and bridges: using Amsterdam's transit system to secure K8S networks by Cailyn Edwards]
+
+<!--
+  References
+  -->
+
+<!-- In-article sections -->
+[further readings]: #further-readings
+
+<!-- Knowledge base -->
+[kubernetes]: README.md
+[network policies]: network%20policies.md
+
+<!-- Others -->
+[canals and bridges: using amsterdam's transit system to secure k8s networks by cailyn edwards]: https://www.youtube.com/watch?v=N1XvgWXnEik