Add license information and update footer in README and footer.html

Author: rkttu

LICENSE

@@ -0,0 +1,40 @@
+Creative Commons Attribution 4.0 International License (CC BY 4.0)
+
+Copyright (c) 닷넷데브 (dotnetdev.kr)
+
+이 저작물은 크리에이티브 커먼즈 저작자표시 4.0 국제 라이선스에 따라
+이용할 수 있습니다.
+
+You are free to:
+
+  Share — copy and redistribute the material in any medium or format
+  Adapt — remix, transform, and build upon the material for any purpose,
+          even commercially
+
+Under the following terms:
+
+  Attribution — You must give appropriate credit, provide a link to the
+                license, and indicate if changes were made. You may do so
+                in any reasonable manner, but not in any way that suggests
+                the licensor endorses you or your use.
+
+  No additional restrictions — You may not apply legal terms or
+                               technological measures that legally restrict
+                               others from doing anything the license permits.
+
+Notices:
+
+  You do not have to comply with the license for elements of the material
+  in the public domain or where your use is permitted by an applicable
+  exception or limitation.
+
+  No warranties are given. The license may not give you all of the
+  permissions necessary for your intended use. For example, other rights
+  such as publicity, privacy, or moral rights may limit how you use the
+  material.
+
+For the full license text, see:
+https://creativecommons.org/licenses/by/4.0/legalcode
+
+For a human-readable summary, see:
+https://creativecommons.org/licenses/by/4.0/

README.md

@@ -1,5 +1,8 @@
 # dotnetdevkr.github.io
 
+[![GitHub Pages](https://github.com/dotnetdev-kr/dotnetdev-kr.github.io/actions/workflows/pages/pages-build-deployment/badge.svg)](https://github.com/dotnetdev-kr/dotnetdev-kr.github.io/actions/workflows/pages/pages-build-deployment)
+[![License: CC BY 4.0](https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by/4.0/)
+
 이 리포지터리는 dotnetdev.kr 도메인을 위한 웹 콘텐츠 및 단체 설립에 관련된 공시 자료를 담는 공개 리포지터리입니다.
 
 ## 로컬 개발 환경
@@ -33,3 +36,8 @@ LiveReload가 활성화되어 파일 수정 시 자동 새로고침됩니다.
 ```bash
 podman-compose down
 ```
+
+## 라이선스
+
+이 저작물은 [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) 라이선스에 따라 이용할 수 있습니다.
+

_includes/footer.html

@@ -1,6 +1,9 @@
 <footer class="site-footer">
   <div class="footer-content">
-    <p>&copy; 2019-{{ site.time | date: '%Y' }} 닷넷데브(dotnetdev.kr) - 모든 권리 보유</p>
+    <p>&copy; 2019-{{ site.time | date: '%Y' }} 닷넷데브(dotnetdev.kr)</p>
+    <p>
+      이 저작물은 <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="license">CC BY 4.0</a> 라이선스에 따라 이용할 수 있습니다.
+    </p>
     <p>
       <a href="/privacy/">개인정보처리방침</a> |
       <a href="/disclosures/">정보공시</a> |