Spelling and Grammar Errors in App Success Message

[huan11]

Here is the corrected version with the changes in bold:

Create App Success!
Congratulations! Your app has been created successfully. Next:

• Open the project by clicking the open button below.
• Go to the terminal to install dependencies using Yarn or Npm.
• Run the 'start' script in the Scripts tab to start the development server.
• Enjoy!