add: Doc for Smart Retry Middleware (#460)

Author: GefMar

docs/available-components/middlewares.md

@@ -34,6 +34,57 @@ async def test():
 
 `retry_on_error` enables retries for a task. `max_retries` is the maximum number of times,.
 
+## Smart Retry Middleware
+
+The `SmartRetryMiddleware` automatically retries tasks with flexible delay settings and retry strategies when errors occur. This is particularly useful when tasks fail due to temporary issues, such as network errors or temporary unavailability of external services.
+
+### Key Features:
+
+* **Retry Limits**: Set the maximum number of retry attempts (`max_retries`).
+* **Delay Before Retry**: Define a fixed delay or use additional strategies.
+* **Jitter**: Adds random delay variations to distribute retries evenly and prevent simultaneous task execution.
+* **Exponential Backoff**: Increases the delay for each subsequent retry, useful for gradually recovering system performance.
+* **Custom Schedule Source (`schedule_source`)**: Enables using a custom schedule source to manage delayed task execution.
+
+### Middleware Integration
+
+To use `SmartRetryMiddleware`, add it to the list of middlewares in your broker:
+
+```python
+from taskiq import ZeroMQBroker
+from taskiq.middlewares import SmartRetryMiddleware
+
+broker = ZeroMQBroker().with_middlewares(
+    SmartRetryMiddleware(
+        default_retry_count=5,
+        default_delay=10,
+        use_jitter=True,
+        use_delay_exponent=True,
+        max_delay_exponent=120
+    ),
+)
+```
+
+### Using Middleware with Tasks
+
+To enable retries for a specific task, specify the following parameters:
+
+```python
+@broker.task(retry_on_error=True, max_retries=10, delay=15)
+async def my_task():
+    raise Exception("Error, retrying!")
+```
+
+* `retry_on_error`: Enables the retry mechanism for the specific task.
+* `max_retries`: Maximum number of retries (overrides middleware default).
+* `delay`: Initial delay before retrying the task, in seconds.
+
+### Usage Recommendations
+
+Use jitter and exponential backoff to avoid repetitive load peaks, especially in high-load systems. Choose appropriate `max_delay_exponent` values to prevent excessively long intervals between retries if your task execution is time-sensitive.
+
+
+
 ### Prometheus middleware
 
 You can enable prometheus metrics for workers by adding PrometheusMiddleware.