Add Readme.md with project details

A new Readme.md file has been added. It provides an overview of the SimpleWebApi8 project, its features, prerequisites, installation steps, usage guide, contribution guideline, and license detail.

Readme.md

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+# SimpleWebApi8 Project
+
+This is a simple ASP.NET 8.0 web API project implemented with modern practices.
+
+## Description
+
+The API has been developed using ASP.NET 8.0 with minimalist programming style. It provides an API interface for managing devices.
+
+## Features
+
+- Communication with a PostgreSQL database using Marten, a .NET transactional document database and event store library.
+- API documentation using SwaggerUI/OpenAPI for better interface visibility.
+- Endpoints for device data management including creating and retrieving devices.
+
+## Getting Started
+
+### Prerequisites
+
+- .NET 8.0 SDK
+- PostgreSQL database
+
+### Installation
+
+1. Clone the repository to your machine.
+2. Update the connection string in the `builder.Configuration.GetConnectionString("Postgres")` line in `Program.cs`.
+3. Restore the dependencies: `dotnet restore`
+4. Build the project: `dotnet build`
+5. Run the project: `dotnet run`
+
+## Usage
+
+Visit `localhost:5000/swagger` in your browser to see and test the available API endpoints:
+
+- `createDevice`: Creates a new device.
+- `device/{deviceId:guid}`: Gets the specified device by its GUID.
+
+## Contributing
+
+Contributions are welcome. Create a fork, make your changes, and then issue a pull request.
+
+Remember to maintain the minimalist programming style and include unit tests where applicable.
+
+## License
+
+Open for modification and redistribution under MIT License.