Add a gitignore and the package-lock.json.

.gitignore

@@ -0,0 +1,34 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+build/
+out/
+
+# Environment variables
+.env
+.env.local
+.env.*.local
+!.env.example
+
+# Logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Caches
+.npm
+.eslintcache
+.cache/
+coverage/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.idea/
+.vscode/
+*.swp