chore: update readme

Author: Dockerel

README.md

@@ -0,0 +1,22 @@
+# Today I Learned
+
+https://dockerel.github.io/TIL/
+
+## 로컬에서 띄우기
+
+```bash
+$ yarn
+$ yarn dev
+```
+
+### 빌드 및 배포
+
+Opt1. GitHub Actions로 자동화
+[main.yaml](https://github.com/Dockerel/TIL/blob/main/.github/workflows/main.yml) 참고
+
+Opt2. 직접 배포
+
+```bash
+$ yarn build
+$ yarn deploy
+```