Add initial implementation of API, database, and user management components.

MikrocopApi/Exceptions/AppException.cs

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+namespace MikrocopApi.Exceptions;
+
+public abstract class AppException : Exception
+{
+    protected AppException(string message) : base(message)
+    {
+    }
+
+    public abstract int StatusCode { get; }
+    public abstract string Title { get; }
+}

MikrocopApi/Exceptions/BadRequestException.cs

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+namespace MikrocopApi.Exceptions;
+
+public sealed class BadRequestException : AppException
+{
+    public BadRequestException(string message) : base(message)
+    {
+    }
+
+    public override int StatusCode => StatusCodes.Status400BadRequest;
+    public override string Title => "Bad Request";
+}

MikrocopApi/Exceptions/ConflictException.cs

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+namespace MikrocopApi.Exceptions;
+
+public sealed class ConflictException : AppException
+{
+    public ConflictException(string message) : base(message)
+    {
+    }
+
+    public override int StatusCode => StatusCodes.Status409Conflict;
+    public override string Title => "Conflict";
+}

MikrocopApi/Exceptions/NotFoundException.cs

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+namespace MikrocopApi.Exceptions;
+
+public sealed class NotFoundException : AppException
+{
+    public NotFoundException(string message) : base(message)
+    {
+    }
+
+    public override int StatusCode => StatusCodes.Status404NotFound;
+    public override string Title => "Not Found";
+}

MikrocopApi/Exceptions/UnauthorizedException.cs

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+namespace MikrocopApi.Exceptions;
+
+public sealed class UnauthorizedException : AppException
+{
+    public UnauthorizedException(string message) : base(message)
+    {
+    }
+
+    public override int StatusCode => StatusCodes.Status401Unauthorized;
+    public override string Title => "Unauthorized";
+}