chore: Linter/Formatterの導入 (#2)

.eslintignore

@@ -0,0 +1,3 @@
+node_modules/
+.next/
+build/

.eslintrc.js

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+module.exports = {
+  parser: '@typescript-eslint/parser',
+  env: {
+    node: true,
+    browser: true,
+    es6: true,
+  },
+  plugins: [
+    '@typescript-eslint',
+    'import',
+    'react',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:react/recommended',
+    'prettier',
+  ],
+  rules: {
+    'react/prop-types': 'off',
+    'import/order': 'error',
+  }
+}

.prettierignore

@@ -0,0 +1,5 @@
+node_modules
+.next
+build
+package.json
+package-lock.json

.prettierrc.js

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+module.exports = {
+  semi: false,
+  singleQuote: true,
+  arrowParens: 'avoid',
+}