Add project files.

PluginManager/Others/Exceptions/APIException.cs

@@ -0,0 +1,37 @@
+using System;
+
+namespace PluginManager.Others.Exceptions
+{
+    [System.Serializable]
+    public class APIException : Exception
+    {
+        public string? Function { get; }
+        public Error? ErrorCode { get; }
+
+        public APIException(string message, string? function, Error? errorCode) : base(message)
+        {
+            ErrorCode = errorCode;
+            Function = function;
+        }
+
+        public APIException(string message, string? function) : base(message)
+        {
+            ErrorCode = Error.UNKNOWN_ERROR;
+            Function = function;
+        }
+
+        public APIException(string message) : base(message)
+        {
+            ErrorCode = Error.UNKNOWN_ERROR;
+            Function = "Unspecified_Function";
+        }
+
+        public void Print()
+        {
+            Console.WriteLine("Message Content: " + Message);
+            Console.WriteLine("Function: " + Function);
+            Console.WriteLine("Error Code: " + ErrorCode.ToString());
+        }
+    }
+
+}