Add README trnaslated into Korean

Korean was added to README.
Words that can be used as nouns were kept the same.

Signed-off-by: Youngjun <yj.yoo@okestro.com>

README-ko_kr.md

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+[![headline](docs/assets/headline.png)](https://backstage.io/)
+
+# [Backstage](https://backstage.io)
+
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![CNCF Status](https://img.shields.io/badge/cncf%20status-incubation-blue.svg)](https://www.cncf.io/projects)
+[![Discord](https://img.shields.io/discord/687207715902193673?logo=discord&label=Discord&color=5865F2&logoColor=white)](https://discord.gg/backstage-687207715902193673)
+![Code style](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)
+[![Codecov](https://img.shields.io/codecov/c/github/backstage/backstage)](https://codecov.io/gh/backstage/backstage)
+[![](https://img.shields.io/github/v/release/backstage/backstage)](https://github.com/backstage/backstage/releases)
+[![Uffizzi](https://img.shields.io/endpoint?url=https%3A%2F%2Fapp.uffizzi.com%2Fapi%2Fv1%2Fpublic%2Fshields%2Fgithub.com%2Fbackstage%2Fbackstage)](https://app.uffizzi.com/ephemeral-environments/backstage/backstage)
+[![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/7678/badge)](https://bestpractices.coreinfrastructure.org/projects/7678)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/backstage/backstage/badge)](https://securityscorecards.dev/viewer/?uri=github.com/backstage/backstage)
+
+## What is Backstage?
+
+[Backstage](https://backstage.io/) is an open platform for building developer portals. Powered by a centralized software catalog, Backstage restores order to your microservices and infrastructure and enables your product teams to ship high-quality code quickly without compromising autonomy.
+
+Backstage unifies all your infrastructure tooling, services, and documentation to create a streamlined development environment from end to end.
+
+![software-catalog](docs/assets/header.png)
+
+Out of the box, Backstage includes:
+
+- [Backstage Software Catalog](https://backstage.io/docs/features/software-catalog/) for managing all your software such as microservices, libraries, data pipelines, websites, and ML models
+- [Backstage Software Templates](https://backstage.io/docs/features/software-templates/) for quickly spinning up new projects and standardizing your tooling with your organization’s best practices
+- [Backstage TechDocs](https://backstage.io/docs/features/techdocs/) for making it easy to create, maintain, find, and use technical documentation, using a "docs like code" approach
+- Plus, a growing ecosystem of [open source plugins](https://github.com/backstage/backstage/tree/master/plugins) that further expand Backstage’s customizability and functionality
+
+Backstage was created by Spotify but is now hosted by the [Cloud Native Computing Foundation (CNCF)](https://www.cncf.io) as an Incubation level project. For more information, see the [announcement](https://backstage.io/blog/2022/03/16/backstage-turns-two#out-of-the-sandbox-and-into-incubation).
+
+## Project roadmap
+
+For information about the detailed project roadmap including delivered milestones, see [the Roadmap](https://backstage.io/docs/overview/roadmap).
+
+## Getting Started
+
+To start using Backstage, see the [Getting Started documentation](https://backstage.io/docs/getting-started).
+
+## Documentation
+
+The documentation of Backstage includes:
+
+- [Main documentation](https://backstage.io/docs)
+- [Software Catalog](https://backstage.io/docs/features/software-catalog/)
+- [Architecture](https://backstage.io/docs/overview/architecture-overview) ([Decisions](https://backstage.io/docs/architecture-decisions/))
+- [Designing for Backstage](https://backstage.io/docs/dls/design)
+- [Storybook - UI components](https://backstage.io/storybook)
+
+## Community
+
+To engage with our community, you can use the following resources:
+
+- [Discord chatroom](https://discord.gg/backstage-687207715902193673) - Get support or discuss the project
+- [Contributing to Backstage](https://github.com/backstage/backstage/blob/master/CONTRIBUTING.md) - Start here if you want to contribute
+- [RFCs](https://github.com/backstage/backstage/labels/rfc) - Help shape the technical direction
+- [FAQ](https://backstage.io/docs/FAQ) - Frequently Asked Questions
+- [Code of Conduct](CODE_OF_CONDUCT.md) - This is how we roll
+- [Adopters](ADOPTERS.md) - Companies already using Backstage
+- [Blog](https://backstage.io/blog/) - Announcements and updates
+- [Newsletter](https://spoti.fi/backstagenewsletter) - Subscribe to our email newsletter
+- [Backstage Community Sessions](https://github.com/backstage/community) - Join monthly meetups and explore Backstage community
+- Give us a star ⭐️ - If you are using Backstage or think it is an interesting project, we would love a star ❤️
+
+## License
+
+Copyright 2020-2023 © The Backstage Authors. All rights reserved. The Linux Foundation has registered trademarks and uses trademarks. For a list of trademarks of The Linux Foundation, please see our Trademark Usage page: https://www.linuxfoundation.org/trademark-usage
+
+Licensed under the Apache License, Version 2.0: http://www.apache.org/licenses/LICENSE-2.0
+
+## Security
+
+Please report sensitive security issues using Spotify's [bug-bounty program](https://hackerone.com/spotify) rather than GitHub.
+
+For further details, see our complete [security release process](SECURITY.md).