Add project files.

Inspectron.Epson/EpsonExceptions.cs

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+namespace Inspectron.Epson;
+
+/// <summary>
+/// Base exception for all Epson printer-related errors
+/// </summary>
+public class EpsonPrinterException : Exception
+{
+    public EpsonPrinterException() { }
+    public EpsonPrinterException(string message) : base(message) { }
+    public EpsonPrinterException(string message, Exception innerException) : base(message, innerException) { }
+}
+
+/// <summary>
+/// Exception thrown when connection to the printer fails or is lost
+/// </summary>
+public class EpsonConnectionException : EpsonPrinterException
+{
+    public string? PrinterIp { get; }
+    public int? PrinterPort { get; }
+
+    public EpsonConnectionException() { }
+
+    public EpsonConnectionException(string message) : base(message) { }
+
+    public EpsonConnectionException(string message, Exception innerException) : base(message, innerException) { }
+
+    public EpsonConnectionException(string message, string printerIp, int printerPort) : base(message)
+    {
+        PrinterIp = printerIp;
+        PrinterPort = printerPort;
+    }
+
+    public EpsonConnectionException(string message, string printerIp, int printerPort, Exception innerException)
+        : base(message, innerException)
+    {
+        PrinterIp = printerIp;
+        PrinterPort = printerPort;
+    }
+}
+
+/// <summary>
+/// Exception thrown when a command sent to the printer fails
+/// </summary>
+public class EpsonCommandException : EpsonPrinterException
+{
+    public byte[]? Command { get; }
+
+    public EpsonCommandException() { }
+
+    public EpsonCommandException(string message) : base(message) { }
+
+    public EpsonCommandException(string message, Exception innerException) : base(message, innerException) { }
+
+    public EpsonCommandException(string message, byte[] command) : base(message)
+    {
+        Command = command;
+    }
+
+    public EpsonCommandException(string message, byte[] command, Exception innerException)
+        : base(message, innerException)
+    {
+        Command = command;
+    }
+}