[ADD] README.md

Author: joys1006

README.md

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+> React.js Sample code
+
+## Build Setup (npm) (실행 방법)
+
+node version v14.0.0
+
+``` bash
+# install dependencies (초기설정 - 공통)
+npm install
+
+# serve with hot reload at localhost:3000 (실행중 중복된 포트가 있을경우 유동적임)
+npm start
+
+# build for production with minification (빌드)
+npm run build
+
+# build for production and view the bundle analyzer report (빌드 리포트)
+npm run build --report
+
+# run all tests (테스트)
+npm test
+```
+
+## Spec (개발 환경 스펙)
+- Redux-Saga
+- ES6 ~
+- Axios
+- Styled-component
+- typescript
+- react
+- react-router-dom
+- redux-logger
+- react-hot-loader