docs: new About for README

README.md

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-**werf** is an Open Source CLI tool written in Go, designed to simplify and speed up the delivery of applications. To use it, you need to describe the configuration of your application (in other words, how to build and deploy it to Kubernetes) and store it in a Git repo — the latter acts as a single source of truth. In short, that's what we call GitOps today.
+**werf** is a solution for implementing efficient and consistent software delivery to Kubernetes. It covers the entire life cycle of CI/CD and related artifacts, gluing commonly used tools (Git, Docker, Helm, K8s) and facilitating best practices.
 
 * werf builds Docker images using Dockerfiles or an alternative fast built-in builder based on the custom syntax. It also deletes unused images from the Docker registry.
 * werf deploys your application to Kubernetes using a chart in the Helm-compatible format with handy customizations and improved rollout tracking mechanism, error detection, and log output.