Added StatusFilter

Author: Jako Menkveld

Src/Notion.Client/Models/Filters/StatusFilter.cs

@@ -0,0 +1,53 @@
+using Newtonsoft.Json;
+
+namespace Notion.Client
+{
+    public class StatusFilter : SinglePropertyFilter, IRollupSubPropertyFilter
+    {
+        [JsonProperty("status")]
+        public Condition Status { get; set; }
+
+        public StatusFilter(
+            string propertyName,
+            string equal = null,
+            string doesNotEqual = null,
+            bool? isEmpty = null,
+            bool? isNotEmpty = null)
+        {
+            Property = propertyName;
+            Status = new Condition(
+                equal: equal,
+                doesNotEqual: doesNotEqual,
+                isEmpty: isEmpty,
+                isNotEmpty: isNotEmpty
+            );
+        }
+
+        public class Condition
+        {
+            [JsonProperty("equals")]
+            public string Equal { get; set; }
+
+            [JsonProperty("does_not_equal")]
+            public string DoesNotEqual { get; set; }
+
+            [JsonProperty("is_empty")]
+            public bool? IsEmpty { get; set; }
+
+            [JsonProperty("is_not_empty")]
+            public bool? IsNotEmpty { get; set; }
+
+            public Condition(
+                string equal = null,
+                string doesNotEqual = null,
+                bool? isEmpty = null,
+                bool? isNotEmpty = null)
+            {
+                Equal = equal;
+                DoesNotEqual = doesNotEqual;
+                IsEmpty = isEmpty;
+                IsNotEmpty = isNotEmpty;
+            }
+        }
+    }
+}