First commit

Sample/Runtime/ExposedProperty/FloatProperty.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace Misaki.GraphView.Sample
+{
+    [Serializable]
+    public class FloatProperty : ExposedProperty
+    {
+        public float value;
+
+        public override object Value
+        {
+            get => value;
+            set => this.value = (float) value;
+        }
+
+        public override Type GetValueType() => typeof(float);
+    }
+}