Create README.md

Add script to create OWT subsamples

README.md

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+These files were created with the following script:
+
+```python
+from datasets import load_dataset
+from tqdm import tqdm
+import io
+
+dataset = load_dataset("Skylion007/openwebtext")['train']
+split_dataset = dataset.train_test_split(train_size=2400000, test_size=60000, seed=0)
+
+
+with io.open('data/owt_train.txt','w') as fopen:
+    listout = []
+    for data in tqdm(split_dataset['train']):
+        listout.append(data['text']+'<|endoftext|>')
+        if len(listout) > 1000:
+            _ = fopen.write(''.join(listout))
+            listout = []
+
+
+with io.open('data/owt_valid.txt','w') as fopen:
+    listout = []
+    for data in tqdm(split_dataset['test']):
+        listout.append(data['text']+'<|endoftext|>')
+        if len(listout) > 1000:
+            _ = fopen.write(''.join(listout))
+            listout = []
+```