Added ILogger and LoggingSeverityLevel enum.

Source/Vima.LoggingAbstractor.Core/ILogger.cs

@@ -0,0 +1,36 @@
+using System;
+
+namespace Vima.LoggingAbstractor.Core
+{
+    /// <summary>
+    /// Represents an instance of a logger. 
+    /// </summary>
+    public interface ILogger
+    {
+        /// <summary>
+        /// Traces the message.
+        /// </summary>
+        /// <param name="message">The message.</param>
+        void TraceMessage(string message);
+
+        /// <summary>
+        /// Traces the message.
+        /// </summary>
+        /// <param name="message">The message to be logged.</param>
+        /// <param name="loggingSeverityLevel">The logging severity level.</param>
+        void TraceMessage(string message, LoggingSeverityLevel loggingSeverityLevel);
+
+        /// <summary>
+        /// Traces the exception.
+        /// </summary>
+        /// <param name="exception">The exception.</param>
+        void TraceException(Exception exception);
+
+        /// <summary>
+        /// Traces the exception.
+        /// </summary>
+        /// <param name="exception">The exception.</param>
+        /// <param name="loggingSeverityLevel">The logging severity level.</param>
+        void TraceException(Exception exception, LoggingSeverityLevel loggingSeverityLevel);
+    }
+}

Source/Vima.LoggingAbstractor.Core/LoggingSeverityLevel.cs

@@ -0,0 +1,41 @@
+using System;
+
+namespace Vima.LoggingAbstractor.Core
+{
+    /// <summary>
+    /// Represents the severity of the logged message or exception.
+    /// </summary>
+    [Flags]
+    public enum LoggingSeverityLevel
+    {
+        /// <summary>
+        /// Verbose.
+        /// </summary>
+        Verbose = 1,
+
+        /// <summary>
+        /// Information.
+        /// </summary>
+        Information = 2,
+
+        /// <summary>
+        /// Warning.
+        /// </summary>
+        Warning = 4,
+
+        /// <summary>
+        /// Error.
+        /// </summary>
+        Error = 8,
+
+        /// <summary>
+        /// Critical.
+        /// </summary>
+        Critical = 16,
+
+        /// <summary>
+        /// None.
+        /// </summary>
+        None = 32
+    }
+}