Add section to docs about scheduling

docs/source/index.rst

@@ -40,6 +40,7 @@ Welcome to Pyrogram
     topics/more-on-updates
     topics/config-file
     topics/smart-plugins
+    topics/scheduling
     topics/auto-auth
     topics/session-settings
     topics/tgcrypto

docs/source/topics/scheduling.rst

@@ -0,0 +1,73 @@
+Scheduling tasks
+================
+
+Pyrogram itself as Telegram MTProto API Framework contains only stuff
+related to Telegram. Scheduling is out of it's scope.
+
+But it is easy to integrate pyrogram with your favourite scheduler.
+
+schedule
+--------
+
+Note that schedule is not suitable for async version of pyrogram.
+
+.. code-block:: python
+
+    import time
+    import schedule
+
+
+    def job():
+        app.send_message("me", "Hi!")
+
+
+    schedule.every(10).minutes.do(job)
+    schedule.every().hour.do(job)
+    schedule.every().day.at("10:30").do(job)
+    schedule.every(5).to(10).minutes.do(job)
+    schedule.every().monday.do(job)
+    schedule.every().wednesday.at("13:15").do(job)
+    schedule.every().minute.at(":17").do(job)
+
+    with app:
+        while True:
+            schedule.run_pending()
+            time.sleep(1)
+
+
+apscheduler
+-----------
+
+.. code-block:: python
+
+    import time
+    from apscheduler.schedulers.background import BackgroundScheduler
+
+
+    def job():
+        app.send_message("me", "Hi!")
+
+
+    scheduler = BackgroundScheduler()
+    scheduler.add_job(job, 'interval', seconds=3)
+
+    scheduler.start()
+    app.run()
+
+Apscheduler supports async version of pyrogram too, here is async example:
+
+.. code-block:: python
+
+    from apscheduler.schedulers.asyncio import AsyncIOScheduler
+
+
+    async def job():
+        await app.send_message("me", "Hi!")
+
+
+    scheduler = AsyncIOScheduler()
+    scheduler.add_job(job, 'interval', seconds=3)
+
+    scheduler.start()
+    app.run()
+