Add relationships feature and EF migration

src/RecNet.Domain/Profiles/Relationship.cs

@@ -0,0 +1,35 @@
+using RecNet.Domain.Exceptions;
+
+namespace RecNet.Domain.Profiles;
+
+public class Relationship
+{
+    public Guid OwnerProfileId { get; private set; }
+    
+    public Guid ProfileId { get; private set; }
+
+    public bool Muted { get; private set; }
+    public bool Ignored { get; private set; }
+
+    private Relationship()
+    {
+    }
+
+    public static Relationship Create(Guid ownerProfileId, Guid profileId)
+    {
+        if (ownerProfileId == Guid.Empty || profileId == Guid.Empty)
+            throw new DomainException("Profile IDs cannot be null.");
+
+        return new Relationship
+        {
+            OwnerProfileId = ownerProfileId,
+            ProfileId = profileId
+        };
+    }
+
+    public void Mutate(bool muted, bool ignored)
+    {
+        Muted = muted;
+        Ignored = ignored;
+    }
+}