* Added Redis state storage implementation

src/Telegartor.RedisStateStorage/States/RedisStateStorage.cs

@@ -0,0 +1,35 @@
+using StackExchange.Redis;
+using System.Text.Json;
+using Telegrator.Core.States;
+
+namespace Telegrator.States;
+
+public class RedisStateStorage(IConnectionMultiplexer redis) : IStateStorage
+{
+    private readonly IDatabase _db = redis.GetDatabase();
+
+    /// <inheritdoc/>
+    public async Task SetAsync<T>(string key, T state, CancellationToken cancellationToken)
+    {
+        string json = JsonSerializer.Serialize(state);
+        await _db.StringSetAsync(key, json);
+    }
+
+    /// <inheritdoc/>
+    public async Task<T?> GetAsync<T>(string key, CancellationToken cancellationToken) where T : default
+    {
+        RedisValue json = await _db.StringGetAsync(key);
+        string? jsonStr = json;
+
+        if (jsonStr is null)
+            return default;
+
+        return JsonSerializer.Deserialize<T?>(json: jsonStr);
+    }
+
+    /// <inheritdoc/>
+    public async Task DeleteAsync(string key, CancellationToken cancellationToken = default)
+    {
+        throw new NotImplementedException();
+    }
+}