Update README.md

Author: nattatorn-dev

README.md

@@ -43,8 +43,10 @@ Pixel2
 ## Install
 - Git clone the repository.
 - In the repo directory, run "npm install" to install dependencies
+  - If you have a problem with react-natigation, Do this https://reactnavigation.org/docs/getting-started
 - Run "exp start" to initiate expo. Then, you will see instructions to run a demo on a real device or a simulator.
 
+
 ## Made with help of
 - [react-native](https://github.com/facebook/react-native)
 - [react-native-elements](https://github.com/react-native-training/react-native-elements)