feat: initialize finance project with Fastify, Prisma, and Zod

- Added package.json with necessary dependencies and scripts for development and production.
- Created Prisma schema for BankAccount model with fields: id, name, bankName, accountNumber, createdAt, and updatedAt.
- Implemented Fastify server with CRUD operations for bank accounts, including validation using Zod.
- Added graceful shutdown handling for server and Prisma client.

.gitignore

@@ -1 +1,3 @@
-/overview.md
+node_modules
+# Keep environment variables out of version control
+.env