Fix edgespreaderprototype linter (#15265)

Content.Shared/Spreader/EdgeSpreaderPrototype.cs

@@ -0,0 +1,12 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Spreader;
+
+/// <summary>
+/// Adds this node group to <see cref="Content.Server.Spreader.SpreaderSystem"/> for tick updates.
+/// </summary>
+[Prototype("edgeSpreader")]
+public sealed class EdgeSpreaderPrototype : IPrototype
+{
+    [IdDataField] public string ID { get; } = string.Empty;
+}