Add Spaceshrooms (#17092)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/Random/RandomFillSolution.cs

@@ -0,0 +1,33 @@
+using Content.Shared.Chemistry.Reagent;
+using Content.Shared.FixedPoint;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.List;
+
+namespace Content.Shared.Random;
+
+/// <summary>
+///     Data that specifies reagents that share the same weight and quantity for use with WeightedRandomSolution.
+/// </summary>
+[Serializable, NetSerializable]
+[DataDefinition]
+public sealed class RandomFillSolution
+{
+    /// <summary>
+    ///     Quantity of listed reagents.
+    /// </summary>
+    [DataField("quantity")]
+    public FixedPoint2 Quantity = 0;
+
+    /// <summary>
+    ///     Random weight of listed reagents.
+    /// </summary>
+    [DataField("weight")]
+    public float Weight = 0;
+
+    /// <summary>
+    ///     Listed reagents that the weight and quantity apply to.
+    /// </summary>
+    [DataField("reagents", required: true, customTypeSerializer: typeof(PrototypeIdListSerializer<ReagentPrototype>))]
+    public List<string> Reagents = new();
+}