Added Invite, Notification and Activity

PostFundManagement.Domain/Models/Activity.cs

@@ -0,0 +1,32 @@
+namespace PostFundManagement.Domain.Models;
+
+public class Activity
+{
+    public long Id { get; set; }
+    
+    public long? ProjectId { get; set; }
+
+    public long? MilestoneId { get; set; }
+
+    public Guid CreatedBy { get; set; }
+
+    public Guid? UpdatedBy { get; set; }
+
+    public Guid? ApprovedBy { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+
+    public DateTime? UpdatedAt { get; set; }
+
+    public string? Category { get; set; }
+
+    public ApprovalStatus Status { get; set; }
+
+    public decimal Amount { get; set; }
+
+    public string? Title { get; set; }
+
+    public string? Description { get; set; }
+    
+    public DateTime? PerformedAt { get; set; }
+}