chore: add prettier & lint-staged

+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true

 module.exports = {
   root: true,
-  extends: '@react-native-community',
+  extends: ['@react-native-community', 'plugin:prettier/recommended'],
   parser: '@typescript-eslint/parser',
   plugins: ['@typescript-eslint'],
 };

+{
+  "useTabs": false,
+  "tabWidth": 2,
+  "singleQuote": true,
+  "trailingComma": "es5"
+}

@@ -29,9 +29,13 @@
     "commitizen": "^4.0.3",
     "cz-conventional-changelog": "^3.1.0",
     "eslint": "^6.5.1",
+    "eslint-config-prettier": "^6.10.0",
+    "eslint-plugin-prettier": "^3.1.2",
     "husky": "^4.2.3",
     "jest": "^24.9.0",
+    "lint-staged": ">=10",
     "metro-react-native-babel-preset": "^0.56.0",
+    "prettier": "1.19.1",
     "react-test-renderer": "16.9.0",
     "standard-version": "^7.1.0",
     "typescript": "^3.7.3"
@@ -54,7 +58,11 @@
   },
   "husky": {
     "hooks": {
+      "pre-commit": "lint-staged",
       "commit-msg": "commitlint -E HUSKY_GIT_PARAMS"
     }
+  },
+  "lint-staged": {
+    "*.{js,jsx,ts,tsx}": "eslint --fix"
   }
 }