Add project files.

src/modules/Elsa.Alterations.Core/Models/AlterationLog.cs

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+using Elsa.Common;
+using Microsoft.Extensions.Logging;
+
+namespace Elsa.Alterations.Core.Models;
+
+
+/// <summary>
+/// Represents a log of alterations.
+/// </summary>
+public class AlterationLog 
+{
+    private readonly ISystemClock _systemClock;
+    private readonly List<AlterationLogEntry> _logEntries = new();
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AlterationLog"/> class.
+    /// </summary>
+    public AlterationLog(ISystemClock systemClock)
+    {
+        _systemClock = systemClock;
+    }
+    
+    /// <summary>
+    /// Gets the log entries.
+    /// </summary>
+    public IReadOnlyCollection<AlterationLogEntry> LogEntries => _logEntries.ToList().AsReadOnly();
+
+    /// <summary>
+    /// Adds a log entry.
+    /// </summary>
+    /// <param name="message">The message.</param>
+    /// <param name="logLevel">The log level.</param>
+    /// <param name="eventName">The event that generated the log entry.</param>
+    public void Add(string message, LogLevel logLevel = LogLevel.Information, string? eventName = null)
+    {
+        var entry = new AlterationLogEntry(message, logLevel, _systemClock.UtcNow, eventName);
+        
+        _logEntries.Add(entry);
+    }
+    
+    /// <summary>
+    /// Adds a set of log entries.
+    /// </summary>
+    /// <param name="entries"></param>
+    public void AddRange(IEnumerable<AlterationLogEntry> entries) => _logEntries.AddRange(entries);
+}