manifest.json error

.env

@@ -0,0 +1 @@
+REACT_APP_API_URL=http://localhost:4005

.gitignore

@@ -1 +1,23 @@
-node_modules
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

src/components/Navbar.js

@@ -0,0 +1,9 @@
+import React from 'react'
+
+function Navbar() {
+  return (
+    <div>Navbar</div>
+  )
+}
+
+export default Navbar