feat: add eslint and prettier

Author: Naturalclar

.eslintignore

@@ -0,0 +1 @@
+node_modules

.eslintrc.js

@@ -0,0 +1,4 @@
+module.exports = {
+  root: true,
+  extends: ["@react-native-community"]
+};

.prettierrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+  bracketSpacing: false,
+  jsxBracketSameLine: true,
+  singleQuote: true,
+  trailingComma: "all"
+};

package.json

@@ -11,7 +11,8 @@
     "start": "node node_modules/react-native/local-cli/cli.js start",
     "test": "yarn test:flow && yarn test:js",
     "test:flow": "flow check",
-    "test:js": "echo 0"
+    "test:js": "echo 0",
+    "lint": "eslint ."
   },
   "keywords": [
     "react-native",
@@ -30,12 +31,16 @@
   },
   "devDependencies": {
     "@babel/core": "^7.0.0",
+    "@react-native-community/eslint-config": "^0.0.5",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "24.1.0",
     "babel-plugin-module-resolver": "^3.1.3",
+    "eslint": "^6.8.0",
+    "eslint-plugin-prettier": "^3.1.2",
     "flow-bin": "^0.86.0",
     "jest": "24.1.0",
     "metro-react-native-babel-preset": "0.51.1",
+    "prettier": "^1.19.1",
     "react": "16.6.3",
     "react-native": "0.58.4"
   },