Add Prettier formatting script and pre-commit hook

.gitignore

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+# Created by https://www.gitignore.io/api/node
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless
+
+
+# End of https://www.gitignore.io/api/node

package.json

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+{
+  "name": "30-seconds-of-react",
+  "version": "1.0.0",
+  "repository": "git@github.com:30-seconds/30-seconds-of-react.git",
+  "scripts": {
+    "prettier": "prettier **/*.{js,json,css,md}"
+  },
+  "devDependencies": {
+    "husky": "^1.1.2",
+    "lint-staged": "^7.3.0",
+    "prettier": "^1.14.3"
+  },
+  "prettier": {
+    "singleQuote": true
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.{js,json,css,md}": [
+      "prettier --write",
+      "git add"
+    ]
+  }
+}