Adds Network Resource Uploading for admins. (#6904)

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

Content.Client/Administration/Managers/NetworkResourceManager.cs

@@ -0,0 +1,15 @@
+using Content.Shared.Administration;
+
+namespace Content.Client.Administration.Managers;
+
+public sealed class NetworkResourceManager : SharedNetworkResourceManager
+{
+    /// <summary>
+    ///     Callback for when the server sends a new resource.
+    /// </summary>
+    /// <param name="msg">The network message containing the data.</param>
+    protected override void ResourceUploadMsg(NetworkResourceUploadMessage msg)
+    {
+        ContentRoot.AddOrUpdateFile(msg.RelativePath, msg.Data);
+    }
+}