Added content to 100-kubernetes-introduction

src/roadmaps/kubernetes/content/100-kubernetes-introduction/100-what-is-kubernetes.md

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-# What is kubernetes
+# What is Kubernetes
+
+Kubernetes can be described as a platform for managing and running containers. Containers are a type of virtualization technology that allow you to package applications and their dependencies into a single, isolated unit, known as a container image.
+
+Kubernetes provides a way to deploy, manage, and scale these containerized applications in a clustered environment. This makes it easier to deploy, scale, and manage applications, especially microservices-based applications, in a consistent and reliable manner.
+
+Kubernetes provides features such as automatic load balancing, self-healing, and rolling updates, which makes it a popular choice for running production-grade applications. With Kubernetes, you can deploy, manage, and scale your applications in a controlled, predictable, and efficient way, regardless of whether you're running them on-premise, in the cloud, or in a hybrid environment.
+
+Learn more from the following links:
+
+- [Kuberenetes Documentation](https://kubernetes.io/docs/home/)
+- [Overview of Kubernetes](https://kubernetes.io/docs/concepts/overview/)
+- [Tutorial - What is Kubernetes](https://www.youtube.com/watch?v=VnvRFRk_51k)

src/roadmaps/kubernetes/content/100-kubernetes-introduction/101-concepts-and-terminologies.md

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-# Concepts and terminologies
+# Concepts and Terminologies
+
+Following are the main concepts and terminologies in Kubernetes:
+
+1. Cluster: A group of machines, either physical or virtual, that run Kubernetes and work together to host your applications.
+2. Node: A single machine in a cluster that runs containers.
+3. Pod: The smallest and simplest unit in the Kubernetes object model, representing a single instance of a running process in your cluster.
+4. Deployment: A higher-level object that manages replicas of your application and updates to them. A deployment ensures that a specified number of pods are running at any given time.
+5. Service: An abstraction that defines a logical set of pods and a policy by which to access them. Services enable communication between pods and expose your application to the network.
+6. Volume: A way to persist data generated by and used by containers. Volumes allow data to survive beyond the lifetime of a single pod.
+7. Label: A key-value pair that can be attached to objects in Kubernetes, used to organize and select subsets of objects.
+8. Namespace: A virtual cluster for organizing resources within a physical cluster. Used for isolating resources and sharing cluster access.
+9. Kubelet: An agent that runs on each node in the cluster and communicates with the control plane to ensure that containers are running as expected.
+10. kubectl: A command-line tool for interacting with a Kubernetes cluster.
+
+Learn more from the following links:
+
+- [Concepts - Kubernetes](https://kubernetes.io/docs/concepts/)
+- [Overview of Kubernetes](https://kubernetes.io/docs/concepts/overview/)
+- [Kubernetes Basics](https://www.youtube.com/watch?v=B_X4l4HSgtc)

src/roadmaps/kubernetes/content/100-kubernetes-introduction/102-kubernetes-vs-other-container-orchestration-tools.md

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-# Kubernetes vs other container orchestration tools
+# Kubernetes vs other Container Orchestration Tools
+
+Kubernetes is one of the most popular and widely used container orchestration tools, but there are several other tools available for managing containers, such as:
+
+- Docker Swarm
+- Apache Mesos
+- Amazon ECS (Elastic Container Service)
+- Hashicorp Nomad
+
+When comparing these tools to Kubernetes, there are several key differences to consider:
+
+1. Complexity: Kubernetes is more complex than other tools, but provides more features and greater flexibility for deploying and managing containers.
+2. Community: Kubernetes has a large and active community, providing a wealth of resources and support.
+3. Portability: Kubernetes has better portability and can run on multiple platforms, including on-premise, in the cloud, or in a hybrid environment.
+4. Integrations: Kubernetes has a large number of integrations with other tools and services, making it easier to manage and operate containers.
+
+Learn more from the following resources:
+
+- [Production-Grade Container Orchestration](https://kubernetes.io/)
+- [Docker vs Kubernetes vs Docker Swarm](https://www.youtube.com/watch?v=9_s3h_GVzZc)

src/roadmaps/kubernetes/content/100-kubernetes-introduction/index.md

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-# Introduction
+# Introduction
+
+Kubernetes is an open-source platform for automating deployment, scaling, and management of containerized applications. It helps in organizing and scheduling containers on a cluster of machines and ensures that they run as intended. It provides features like self-healing, rollouts and rollbacks, service discovery, and secret management. Kubernetes helps in building and deploying highly available, scalable applications that run in containers. It has become a popular platform for deploying microservices-based applications and is widely adopted in the industry.
+
+Learn more from the following resources:
+
+- [Kubernetes Documentation](https://kubernetes.io/docs/home/)
+- [Kubernetes Tutorial for Beginners](https://www.youtube.com/watch?v=X48VuDVv0do)
+- [Introduction To Kubernetes](https://www.youtube.com/watch?v=ISUmszlMQPU)