README.md: Add intro, and site structure

(with special thanks part)

Author: dokabi

README.md

@@ -1,5 +1,30 @@
 # openinfra-kr-homepage
 
-openinfra-kr.org homepage repository
+The new Website of OpenInfra Korea Group.
 
-Static page: Hugo
+## How is was built
+
+Built with [Hugo](https://gohugo.io).
+
+Inspired overall homepage structure and maintainence practices from [Ubuntu Korea Community Homepage](https://github.com/ubuntu-kr/ubuntu-kr.github.io) and organizers
+
+  - Special thanks: [@sukso96100](https://github.com/sukso96100), [@kkumtree](https://github.com/kkumtree) & [@Silica96](https://github.com/Silica96)
+
+## License
+Apache 2.0 License + Zerostatic Pro License for theme (See `LICENSE`)
+
+## Repository structure
+
+- ``config.yaml``: Hugo configuration file that defines the site's basic settings, including multi-language support for Korean and English.
+
+- ``themes/openinfrakr``: The theme is customized from [Hugo Advance](https://www.zerostatic.io/theme/hugo-advance/)
+
+  - Static images are stored in the ``static/images`` sub-folder.
+
+- ``content``: Static Markdown files for content
+
+  - Multi-languages: Files are paired for Korean (``__name__.md``) and English (``__name__.en.md``) versions.
+
+## Additional Information
+
+The OpenInfra Korea Group is a community that discusses various open infrastructure topics, including OpenStack, and organizes regular seminars and events.