chore: initialize eslint setup

.eslintignore

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+node_modules
+build

.eslintrc.json

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+{
+  "parser": "@typescript-eslint/parser", // eslint to TS
+  "plugins": ["@typescript-eslint"],
+  "extends": [
+    "plugin:@typescript-eslint/recommended", // ts 추천 rules https://github.com/typescript-eslint/typescript-eslint#readme
+    "plugin:react/recommended", // react 추천 rules. https://github.com/yannickcr/eslint-plugin-react
+    "plugin:react-hooks/recommended", // react-hook 추천 rules. https://github.com/facebook/react
+    "plugin:jsx-a11y/recommended", // jsx 추천 rules. https://www.npmjs.com/package/eslint-plugin-jsx-a11y
+    "plugin:import/errors", // es6+ import/export syntax linting 지원. https://www.npmjs.com/package/eslint-plugin-import
+    "plugin:import/warnings" // es6+ import/export syntax linting 지원. https://www.npmjs.com/package/eslint-plugin-import
+  ],
+  "parserOptions": {
+    "ecmaVersion": 2018, // 문법 지원 (기본 값으로 둠)
+    "sourceType": "module" // 모듈 시스템 사용
+  },
+  "rules": {
+    // custom 해야할 규칙 선언
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "react/react-in-jsx-scope": "off",
+    "import/no-unresolved": "off"
+  },
+  "settings": {
+    "react": {
+      "version": "detect"
+    },
+    // module resolve issue로 인해 추가, https://stackoverflow.com/questions/55198502/using-eslint-with-typescript-unable-to-resolve-path-to-module
+    "import/resolver": {
+      "node": {
+        "extensions": [".js", ".jsx", ".ts", ".tsx"]
+      }
+    }
+  }
+}