add finetune BERT for text classification tutorial

Author: x4nth055

machine-learning/nlp/bert-text-classification/README.md

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+# [How to Fine Tune BERT for Text Classification using Transformers in Python](https://www.thepythoncode.com/article/finetuning-bert-using-huggingface-transformers-python)
+To run this:
+- `pip3 install -r requirements.txt`
+- If you want to use scripts, consider `train.py` and `test.py`
+- The notebook `finetune-bert.ipynb` is suggested.
+You can also follow on Google Colab: 
+<a style="box-sizing: border-box; color: #9b59b6; text-decoration-line: none; cursor: pointer; font-family: Calibre, sans-serif; font-size: 14.4px; text-align: -webkit-right;" title="Open in Colab" href="https://colab.research.google.com/drive/18Qqox_QxJkOs80XVYaoLsdum0dX-Ilxb?usp=sharing" target="_blank" rel="noopener"><img style="box-sizing: border-box; border: 0px; vertical-align: middle; max-width: 100%; height: auto;" src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open in Colab" /></a>