Adds missing imports

Adds necessary imports for exception handling, namespace declaration, and standard object usage.
These are required for proper class functionality and dependency resolution.

Initializes base presenter and project setup

Sets up the basic project structure with a base presenter class.

The base presenter:
- Enforces specific flash message methods.
- Provides default auto-close duration for flash messages.
- Configures allowed HTTP methods.

Also includes initial composer setup and .gitignore.