Add builder to create PagesCreateParameters

Author: KoditkarVedant

Src/Notion.Client/Api/Pages/RequestParams/PagesCreateParameters/PagesCreateParametersBuilder.cs

@@ -0,0 +1,48 @@
+using System.Collections.Generic;
+
+namespace Notion.Client
+{
+    public class PagesCreateParametersBuilder
+    {
+        private IPageParent parent;
+        private Dictionary<string, PropertyValue> properties = new Dictionary<string, PropertyValue>();
+        private IList<Block> children = new List<Block>();
+        private IPageIcon icon;
+        private FileObject cover;
+
+        private PagesCreateParametersBuilder()
+        {
+        }
+
+        public static PagesCreateParametersBuilder Create(IPageParent parent)
+        {
+            return new PagesCreateParametersBuilder {
+                parent = parent
+            };
+        }
+
+        public PagesCreateParametersBuilder AddProperty(string nameOrId, PropertyValue value)
+        {
+            properties[nameOrId] = value;
+            return this;
+        }
+
+        public PagesCreateParametersBuilder AddPageContent(Block block)
+        {
+            children.Add(block);
+            return this;
+        }
+
+        public PagesCreateParameters Build()
+        {
+            return new PagesCreateParameters
+            {
+                Parent = parent,
+                Properties = properties,
+                Children = children,
+                Icon = icon,
+                Cover = cover
+            };
+        }
+    }
+}