added federated learning lab

exercises/1-federated_learning/clientlib.py

...-federated_learning/data/cifar-10-batches-py/batches.meta

...-federated_learning/data/cifar-10-batches-py/data_batch_1

...-federated_learning/data/cifar-10-batches-py/data_batch_2

...-federated_learning/data/cifar-10-batches-py/data_batch_3

...-federated_learning/data/cifar-10-batches-py/data_batch_4

...-federated_learning/data/cifar-10-batches-py/data_batch_5

...1-federated_learning/data/cifar-10-batches-py/readme.html

.../1-federated_learning/data/cifar-10-batches-py/test_batch

exercises/1-federated_learning/data/cifar-10-python.tar.gz

exercises/1-federated_learning/device_data.py

exercises/1-federated_learning/exercise_10.ipynb

exercises/1-federated_learning/exercise_11.ipynb

exercises/1-federated_learning/models/__init__.py

exercises/1-federated_learning/models/cifarnet.py