improved README.md

README.md

@@ -2,8 +2,8 @@
 
 ![Rust](https://img.shields.io/badge/rust-%23000000.svg?logo=rust&logoColor=white)
 ![PostgreSQL](https://img.shields.io/badge/PostgreSQL-316192?style=for-square&logo=postgresql&logoColor=white)
-![Axum](https://img.shields.io/badge/Tokio-1.46-green?style=for-square)
+![Tokio](https://img.shields.io/badge/Tokio-1.46-green?style=for-square)
-![Axum](https://img.shields.io/badge/Sqlx-0.8-green?style=for-square)
+![Sqlx](https://img.shields.io/badge/Sqlx-0.8-green?style=for-square)
 ![Axum](https://img.shields.io/badge/Axum-0.8-green?style=for-square)
 
 Intrasys is an internal financial transfers application built with Rust and Axum, providing HTTP endpoints for account management and transaction processing with PostgreSQL as the backing database.
@@ -24,7 +24,10 @@ Intrasys is an internal financial transfers application built with Rust and Axum
 
 ## Quick Start
 
-### 1. Provision PostgreSQL Database
+### 1. Ensure you have rust installed
+Foolow the steps described [here](https://www.rust-lang.org/tools/install) if you don't
+
+### 2. Provision PostgreSQL Database
 
 The easiest way is to run a PostgreSQL container with Docker:
 
@@ -32,21 +35,24 @@ The easiest way is to run a PostgreSQL container with Docker:
 docker run --name intrasys-pg -d -e POSTGRES_PASSWORD=password -p 127.0.0.1:5432:5432 postgres:alpine
 ```
 
-### 2. Configure Environment
+### 2. Run the Application
-
-Create a `.env` file in the project root:
-
-```bash
-echo "DATABASE_URL=postgres://postgres:password@localhost:5432/postgres" > .env
-```
-
-### 3. Run the Application
 
 ```bash
 cargo run
 ```
 
-The application will be available at `http://localhost:3000`
+The application will be available at `http://localhost:8080`
+
+## Running unit tests
+
+Make sure you have an available postgres database and edit `DATABASE_URL` variable in the `.env` file accordingly. If you've used the docker command mentioned in the *Quickstart*
+section you don't need to change anything.
+
+Then run
+
+```bash
+cargo test
+```
 
 ## API Endpoints
 
@@ -81,37 +87,16 @@ The application will be available at `http://localhost:3000`
     "destination_account_id": 456,
     "amount": "50.12345"
   }
-  ```
+ ```
 
-## Development Setup
 
-1. Install Rust toolchain:
-   ```bash
-   curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
-   ```
-
-2. Clone the repository:
-   ```bash
-   git clone https://github.com/yourusername/intrasys.git
-   cd intrasys
-   ```
-
-3. Run database migrations (optional - the app will create tables if they don't exist):
-   ```bash
-   sqlx migrate run
-   ```
 
 ## Assumptions
 
 - All accounts use the same currency
 - No authentication or authorization is implemented
-- Decimal precision of 10 decimal places is sufficient for financial amounts
+- Decimal precision of 2 decimal places is sufficient for financial amounts, maximum allowed monetary amount is (10^18 -0.01) and the minimum is (-10^18 + 0.01)
 - Account IDs are positive integers
+- Account creation must NOT be idempotent since it also sets the account balance (creating an account that already exists should fail)
+- Transfer money to an account that does not exist should not create a new account, but fail with an error (to prevent users from accidentally locking their money forever)
 
-## License
-
-MIT License
-
-## Contributing
-
-Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.