fix

readme.md

@@ -2,6 +2,29 @@
 
 strive to build a [solar system](https://eyes.nasa.gov/apps/solar-system/).
 
+## galaxy
+
+```sh
+$ cd galaxy
+$ yarn install
+$ yarn dev
+```
+
+## galaxy-react
+
+```sh
+$ cd galaxy-react
+$ npm i
+$ npm run start
+```
+
+## solar & particle
+
+```sh
+$ cd xxx
+$ open index.html
+```
+
 ## ref
 
 - [100-stars](https://stars.chromeexperiments.com/)
@@ -13,11 +36,3 @@ strive to build a [solar system](https://eyes.nasa.gov/apps/solar-system/).
 - [the-halfbloodprince/GalaxyM1199](https://github.com/the-halfbloodprince/GalaxyM1199)
 - [the-halfbloodprince/Galaxy-M2999](https://github.com/the-halfbloodprince/Galaxy-M2999)
 - [solarcg/SolarSys](https://github.com/solarcg/SolarSys)
-
-## galaxy-react
-
-```sh
-$ cd galaxy-react
-$ npm i
-$ npm run start
-```