Add basic PDA/Syndicate Uplink. (#942)

Co-authored-by: FL-OZ <anotherscuffed@gmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Shared/Prototypes/PDA/UplinkStoreListingPrototype.cs

@@ -0,0 +1,42 @@
+using Content.Shared.GameObjects.Components.PDA;
+using Robust.Shared.Maths;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.Shared.Prototypes.PDA
+{
+    [Prototype("uplinkListing")]
+    public class UplinkStoreListingPrototype : IPrototype, IIndexedPrototype
+    {
+
+        private string _id;
+        private string _itemId;
+        private int _price;
+        private UplinkCategory _category;
+        private string _desc;
+        private string _name;
+        private Color _displayColor;
+
+        public string ID => _id;
+
+        public string ItemId => _itemId;
+        public int Price => _price;
+        public UplinkCategory Category => _category;
+        public string Description => _desc;
+        public string ListingName => _name;
+        public Color DisplayColor => _displayColor;
+        public void LoadFrom(YamlMappingNode mapping)
+        {
+            var serializer = YamlObjectSerializer.NewReader(mapping);
+            serializer.DataField(ref _id, "id", string.Empty);
+            serializer.DataField(ref _itemId, "itemId", string.Empty);
+            serializer.DataField(ref _price, "price", 5);
+            serializer.DataField(ref _category, "category", UplinkCategory.Utility);
+            serializer.DataField(ref _desc, "description", string.Empty);
+            serializer.DataField(ref _name, "listingName", string.Empty);
+            serializer.DataField(ref _displayColor, "displayColor", Color.White);
+
+        }
+    }
+}