changed package manager

Author: ziyuan-linn

CONTRIBUTING.md

@@ -1,18 +1,19 @@
 ## Setup
 
 This build uses node version 18.15.0 and npm version.
-Install nvm and run the following commands：
+[Install nvm](https://github.com/nvm-sh/nvm#installing-and-updating) and run the following commands：
 
 ```
 nvm install 18.15
 nvm use 18
+npm install -g yarn
 ```
 
 To start the development server, run the following commands:
 
 ```
-npm install
-npm start
+yarn
+yarn start
 ```
 
 You should see something similar to this in the terminal:
@@ -46,7 +47,7 @@ To automatically format a document when saving it, search for "format on save" i
 You can also format a document via the command line. To format all JavaScript documents in the repo, use:
 
 ```
-npm run format
+yarn run format
 ```
 
 To format a specific document, use
@@ -62,8 +63,8 @@ For more options with the command line, refer to the [Prettier Documentation](ht
 To build the ml5 library for production, run the following commands
 
 ```
-npm install
-npm run build
+yarn
+yarn run build
 ```
 
 This will create a production version of the library in `/dist` directory.

README.md

@@ -5,18 +5,19 @@ Welcome to the next-generation repo for the ml5.js project! Due to the complexit
 ## Setup
 
 This build uses node version 18.15.0 and npm version.
-Install nvm and run the following commands：
+[Install nvm](https://github.com/nvm-sh/nvm#installing-and-updating) and run the following commands：
 
 ```
 nvm install 18.15
 nvm use 18
+npm install -g yarn
 ```
 
 To start the development server, run the following commands:
 
 ```
-npm install
-npm start
+yarn
+yarn start
 ```
 
 You should see something similar to this in the terminal: