Add XML docs

RemoteExec.Client/ILoadBalancingStrategy.cs

@@ -1,6 +1,14 @@
 namespace RemoteExec.Client;
 
+/// <summary>
+/// Defines a strategy for selecting a server from a pool of available servers for task distribution.
+/// </summary>
 public interface ILoadBalancingStrategy
 {
+    /// <summary>
+    /// Selects the most appropriate server from the available servers based on the strategy's logic.
+    /// </summary>
+    /// <param name="availableServers">The collection of available servers to choose from.</param>
+    /// <returns>The selected server, or <c>null</c> if no suitable server is found.</returns>
     ServerConnection? SelectServer(IEnumerable<ServerConnection> availableServers);
 }