feat: Add Tags to Photo entity (opt-in via PhotoSearchExtras.Tags)

src/Flickr.Net.Test/Entities/PhotoTests.cs

@@ -62,4 +62,29 @@ public void PhotoDescriptionImplicitStringConversion()
         string description = photo.Description;
         Assert.Equal("A test description", description);
     }
+
+    [Fact]
+    public void PhotoTagsAreDeserialized()
+    {
+        const string json = """{"photos":{"page":1,"pages":1,"perpage":10,"total":1,"photo":[{"id":"52931686549","owner":"192376927@N06","secret":"9b203d4894","server":"65535","farm":66,"title":"DSC04707","ispublic":1,"isfriend":0,"isfamily":0,"tags":"norge oslo sommer"}]},"stat":"ok"}""";
+
+        var result = FlickrConvert.DeserializeObject<FlickrResult<PagedPhotos>>(Encoding.UTF8.GetBytes(json));
+
+        Assert.NotNull(result);
+        Assert.False(result.HasError);
+        var photo = result.Content.Values[0];
+        Assert.Equal("norge oslo sommer", photo.Tags);
+    }
+
+    [Fact]
+    public void PhotoTagsIsNullWhenNotPresent()
+    {
+        const string json = """{"photos":{"page":1,"pages":1,"perpage":10,"total":1,"photo":[{"id":"52931686549","owner":"192376927@N06","secret":"9b203d4894","server":"65535","farm":66,"title":"DSC04707","ispublic":1,"isfriend":0,"isfamily":0}]},"stat":"ok"}""";
+
+        var result = FlickrConvert.DeserializeObject<FlickrResult<PagedPhotos>>(Encoding.UTF8.GetBytes(json));
+
+        Assert.NotNull(result);
+        var photo = result.Content.Values[0];
+        Assert.Null(photo.Tags);
+    }
 }

src/Flickr.Net/Entities/Photo.cs

@@ -23,4 +23,11 @@ public record Photo : UltraDeluxePhotoBase
     /// </summary>
     [JsonPropertyName("description")]
     public Description Description { get; set; }
+
+    /// <summary>
+    /// A space-delimited list of all tags on the photo. Only populated
+    /// when PhotoSearchExtras.Tags is included in the search's Extras.
+    /// </summary>
+    [JsonPropertyName("tags")]
+    public string? Tags { get; set; }
 }