Add llms subdir + update README (#145)

* add llms subdir + update README

* nits

* use same pre-commit as mlx

* update readmes a bit

* format

gcn/datasets.py

@@ -1,9 +1,9 @@
 import os
-import requests
 import tarfile
 
 import mlx.core as mx
 import numpy as np
+import requests
 import scipy.sparse as sparse
 
 """

gcn/main.py

@@ -3,10 +3,10 @@ from argparse import ArgumentParser
 import mlx.core as mx
 import mlx.nn as nn
 import mlx.optimizers as optim
+from datasets import download_cora, load_data, train_val_test_mask
 from mlx.nn.losses import cross_entropy
 from mlx.utils import tree_flatten
 
-from datasets import download_cora, load_data, train_val_test_mask
 from gcn import GCN