diff --git a/.gitignore b/.gitignore
index 0e828e1..b0bab30 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 **lock*
 **_site**
 **.jekyll**
+public/models
diff --git a/public/.DS_Store b/public/.DS_Store
new file mode 100644
index 0000000..91773b3
Binary files /dev/null and b/public/.DS_Store differ
diff --git a/readme.md b/readme.md
index 4703f1a..f52a320 100644
--- a/readme.md
+++ b/readme.md
@@ -10,3 +10,12 @@
 - [100-stars](https://stars.chromeexperiments.com/)
 - [nasa/solar-system](https://eyes.nasa.gov/apps/solar-system/)
 - [nasa/3d-resources](https://github.com/nasa/NASA-3D-Resources)
+- [galaxy.tsx](https://gist.github.com/artokun/fb7f0c68a01ba5d9813abb3ccce254c4)
+
+## branch
+
+```sh
+$ git checkout react
+$ npm i
+$ npm run start
+```