Implement basic unit test infrastructure with abstraction patterns

Co-authored-by: ngenovese11 <23391587+ngenovese11@users.noreply.github.com>

tests/PepperDash.Essentials.Core.Tests/Abstractions/ILogger.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace PepperDash.Essentials.Core.Tests.Abstractions
+{
+    /// <summary>
+    /// Abstraction for logging operations to enable testing
+    /// </summary>
+    public interface ILogger
+    {
+        /// <summary>
+        /// Logs a debug message
+        /// </summary>
+        /// <param name="source">Source of the log message</param>
+        /// <param name="message">Message to log</param>
+        /// <param name="args">Format arguments</param>
+        void LogDebug(object source, string message, params object[] args);
+        
+        /// <summary>
+        /// Logs a verbose message
+        /// </summary>
+        /// <param name="source">Source of the log message</param>
+        /// <param name="message">Message to log</param>
+        /// <param name="args">Format arguments</param>
+        void LogVerbose(object source, string message, params object[] args);
+    }
+}