docs: update readme for react native dependencies

Author: ethanneff

README.md

@@ -2,17 +2,29 @@
 
 ![image](https://i.imgur.com/sa5z3DR.gif)
 
-## install
+### install brew
 
 ```sh
-gem install cocoapods
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
+```
+
+### install dependencies
+
+```sh
+brew install node
+brew install watchman
+sudo gem install cocoapods
 npm i -g yarn
+```
+
+### install code
+
+```sh
 git clone [email protected]:ethanneff/react-native-web-typescript.git
 cd react-native-web-typescript
 yarn install
 cd ios
 pod install
-cd ..
 ```
 
 ### run