iniitial commit of execute_remotely

docs/guides/advanced/execute_remotely.md

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+---
+title: Remote Execution
+---
+
+The [execute_remotely_example](https://github.com/allegroai/clearml/blob/master/examples/advanced/execute_remotely_example.py)
+script demonstrates the use of the [`execute_remotely`](../../references/sdk/task.md#execute_remotely/) method. 
+
+The script does the following: 
+* Trains a simple deep neural network on the PyTorch built-in MNIST dataset.
+* Uses ClearML automatic logging.
+* Creates an experiment named `remote_execution pytorch mnist train`, which is associated with the `examples` project.
+
+When the code is executed, the training runs for one epoch to make sure nothing crashes, then the code passes the `execute_remotely` method
+which terminates the local execution of the code. Execution will switch to remote execution by the agent listening to 
+queue specified in the `queue_name` parameter of the method. 
+
+This feature is especially helpful if you want to run the first epoch locally on your machine to debug and to
+make sure code doesn't crash, and then move to a stronger machine for the entire training.
+