docs: simplify dependencies installation

Adds a `pip install ...` command that will install all necessary dependencies, while retaining original dependency notes. Added quick description of `tqdm` as well.

Author: ctjlewis

README.md

@@ -11,15 +11,19 @@ Because the code is so simple, it is very easy to hack to your needs, train new
 
 ## install
 
+```
+pip install torch numpy transformers datasets tiktoken wandb tqdm
+```
+
 Dependencies:
 
 - [pytorch](https://pytorch.org) <3
 - [numpy](https://numpy.org/install/) <3
-- `pip install transformers` for huggingface transformers <3 (to load GPT-2 checkpoints)
-- `pip install datasets` for huggingface datasets <3 (if you want to download + preprocess OpenWebText)
-- `pip install tiktoken` for OpenAI's fast BPE code <3
-- `pip install wandb` for optional logging <3
-- `pip install tqdm` <3
+-  `transformers` for huggingface transformers <3 (to load GPT-2 checkpoints)
+-  `datasets` for huggingface datasets <3 (if you want to download + preprocess OpenWebText)
+-  `tiktoken` for OpenAI's fast BPE code <3
+-  `wandb` for optional logging <3
+-  `tqdm` for progress bars <3
 
 ## quick start