updated README.md

README: complete with all 4 part results, plots, and live demo link

Merge pull request #3 from dlokesha/part-4-effective-rank-tracker

Merge pull request #2 from dlokesha/part-3-spike-encoder-decoder

Part 4 final: bio rank 21.4 overtakes baseline 20.2 at epoch 7 — richer representations confirmed

Part 3 results: sync coding 87.8% > rate 86.8% — synchrony patterns outperform rate coding

Fix requirements: numpy<2, gradio v5, add python-dotenv

Update Gradio to v5

fix: use allowed colorTo for HF Spaces

Part 2 final: local plasticity mean rank 37.1 — continual backprop rank 33.1 confirms reactive methods worse than standard