add a sample on rds prisma migration

[HarshCasper]

No description provided.

[steffyP]

Nice sample @HarshCasper! 🚀

I verified that the sample is working, when following the README or executing the script 👍
As someone who hasn't experience with prisma, I have some questions/comments:

• it would be nice to add a link and/or some general information about prisma in the README
• Are the files in prisma/migrations required to run the sample? I witnessed that new files are created when I run the sample, so I wonder if these are artifacts from a specific run?
• When I run the script, I still had to install another lib. I was asked during execution if I want to install, so I guess it's fine. But I wonder if we could install it beforehand as well?

  Your database is now in sync with your schema.
  
   ✔ Generated Prisma Client (4.16.2 | library) to ./node_modules/@prisma/client in 128ms
   
   
   ┌─────────────────────────────────────────────────────────┐
   │  Update available 4.16.2 -> 5.9.1                       │
   │                                                         │
   │  This is a major update - please follow the guide at    │
   │  https://pris.ly/d/major-version-upgrade                │
   │                                                         │
   │  Run the following to update                            │
   │    npm i --save-dev prisma@latest                       │
   │    npm i @prisma/client@latest                          │
   └─────────────────────────────────────────────────────────┘
   Need to install the following packages:
     [email protected]
   Ok to proceed? (y) y
  

• For the creation of the database you currently do not set the MasterUsername and MasterUserPassword, and instead rely on LocalStack defaults. This is actually not in parity with AWS, which will deny the request if those parameters are not set. We could leave it that way, but be aware it may lead to errors in the future when we improve parity.
  • Anyhow, it would be great to mention the (default) values for username + password.