Upload Stories260K model

Adds the Stories260K model. A tiny model intended for unit tests and such.
Includes files needed for both inference in Python and for inference in run.c
See readme.md for more details

stories260K/readme.md

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+This 260K model is a tiny model and it was trained as follows:
+
+```
+python train.py \
+    --out_dir="outmini" \
+    --batch_size=128 \
+    --max_seq_len=512 \
+    --gradient_accumulation_steps=1 \
+    --vocab_source="custom" \
+    --vocab_size=512 \
+    --dim=64 \
+    --n_layers=5 \
+    --n_heads=8 \
+    --n_kv_heads=4 \
+    --multiple_of=4 \
+    --learning_rate=1e-3 \
+    --dropout=0.05 \
+    --weight_decay=0.01 \
+    --max_iters=100000 \
+    --beta2=0.99 \
+    --warmup_iters=1000 \
+    --eval_interval=2000 \
+    --eval_iters=100 \
+    --compile=True
+```
+
+You'll notice that `n_kv_heads` is 4 while `n_heads` is 8, so two heads at a time share their key,value projections, i.e. this model is 2X multiquery. You'll also notice that we're using a custom tokenizer with 512 tokens. The model trained for ~10 minutes (?) on my A100 and achieves validation loss of 1.2968.
+
+Sampling this model at temperature 0.0 (i.e. deterministic greedy argmax sampling) gives:
+
+```
+$ ./run stories260K/stories260K.bin -z stories260K/tok512.bin -t 0.0
+Once upon a time, there was a little girl named Lily. She loved to play outside in the park. One day, she saw a big, red ball. She wanted to play with it, but it was too high.
+Lily's mom said, "Lily, let's go to the park." Lily was sad and didn't know what to do. She said, "I want to play with your ball, but I can't find it."
+Lily was sad and didn't know what to do. She said, "I'm sorry, Lily. I didn't know what to do."
+Lily didn't want to help her mom, so she said, "I'm sorry, mom. I didn't know what to do." Her mom said, "Don't worry, Lily. We can help you.
+```
+
+You can reproduce the same in Python by running `sample.py`:
+
+```
+$ python sample.py --checkpoint=stories260K/stories260K.pt --tokenizer=stories260K/tok512.model --temperature=0.0 --max_new_tokens=257
+```
+
+I hardcoded max tokens to be 257 manually because the `sample.py` script doesn't currently terminate on the special BOS token like the run.c script does. Sampling at 1.0 with topp of 0.9 gives a bit more reasonable samples:
+
+```
+$ ./run stories260K/stories260K.bin -z stories260K/tok512.bin -t 1.0 -p 0.9 -s 133742
+Once upon a time, there was a little boy named Timmy. Timmy loved to play with his toys and eat sandwiches. One day, Timmy's mom told him it was time to rest for a while. Timmy's friend Billy came over and took him a down.
+Timmy's mom saw that Timmy was sad, but Timmy said, "I didn't understand what is it! We need to find some leafs." Timmy thought about it and took a deep breath on a spoon. He hoped it was important to be kind and continued to find its image next time.
+After they finished getting, Timmy's dad came up to his house and promised to help Timmy.
+```
+
+Hey you can't expect too much from a 260K parameter model. I'm even mildly shocked we get this far :D

stories260K/stories260K.bin

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stories260K/stories260K.pt

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stories260K/tok512.bin

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stories260K/tok512.model

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