add federated learning

...cises/0-intro/src/.ipynb_checkpoints/lenet-checkpoint.png

...rated_learning/.ipynb_checkpoints/clientlib-checkpoint.py

..._learning/.ipynb_checkpoints/exercise_10-checkpoint.ipynb

..._learning/.ipynb_checkpoints/exercise_11-checkpoint.ipynb

...1-federated_learning/__pycache__/clientlib.cpython-36.pyc

...federated_learning/__pycache__/device_data.cpython-36.pyc

exercises/1-federated_learning/exercise_10.ipynb

exercises/1-federated_learning/exercise_11.ipynb

...rated_learning/models/__pycache__/__init__.cpython-36.pyc

...rated_learning/models/__pycache__/cifarnet.cpython-36.pyc