readme : Why is it developed? section

Author: btungut

README.md

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 ![Code Coverage](https://img.shields.io/badge/Code%20Coverage-51%25-yellow?style=flat)
 ![build](https://img.shields.io/github/actions/workflow/status/btungut/kubeconfig-merge/ci.yml?branch=master)
 ![go](https://img.shields.io/github/go-mod/go-version/btungut/kubeconfig-merge)
+
+## Why is it developed?
+If you are someone who works with a significant number of Kubernetes clusters, dealing with `kubecontext` in a manual way can be **boring** and also **result in problems**.
+In addition to that, I am currently working with more than 20 customers, which results in an average of five clusters per customer.
+
+
 ## Arguments
 
 | Argument     | Description                                                                | Default                                        |