Add project files.

BlazorDeviceInterop.Components/LeafletMap/Map.cs

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+using Microsoft.JSInterop;
+using System.Text.Json.Serialization;
+using System.Threading.Tasks;
+
+namespace BlazorDeviceInterop.Components.LeafletMap
+{
+    public class Map : InteropObject
+    {
+        [JsonIgnore] public string ElementId { get; }
+        [JsonIgnore] public MapOptions Options { get; }
+
+        public Map(string elementId, MapOptions options)
+        {
+            ElementId = elementId;
+            Options = options;
+        }
+
+        protected override async Task<JsRuntimeObjectRef> CreateJsObjectRef(IJSRuntime jsRuntime)
+        {
+            return await jsRuntime.InvokeAsync<JsRuntimeObjectRef>("LeafletMap.map", ElementId, Options);
+        }
+    }
+}