feat: start writing README.md

- also reapply initial nnetwork.ipynb content

README.md

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-# NeuralNetwork
-A simple python neural network.
+<h1 align="center">Game of Life</h1>
+
+<p align="center">
+    <strong>Learn how to build and train a neural network in Python from scratch.</strong><br/>
+    This project goes further by teaching how a network can convert any 8-bit binary number into its corresponding decimal value.
+</p>
+
+<p align="center">
+  <a href="https://www.python.org">
+    <img alt="Python" src="https://img.shields.io/badge/Python-3.x-blue?logo=python&logoColor=white" />
+  </a>
+  <a href="https://github.com/guezoloic/NeuralNetwork">
+    <img alt="GitHub Repo" src="https://img.shields.io/badge/Source-GitHub-181717?logo=github" />
+  </a>
+</p>
+
+## Objective
+
+The goal of this project is to:
+- Understand how artificial neurons, layers, and neural networks work.
+- Implement all components of a neural network (no external libraries).
+- Train the network to map 8-bit binary inputs to decimal values (from 0 to 255).
+
+## Prerequis 
+
+## Links
+- [Sigmoid derivation function](res/sigmoid.png)
+- [Wikipedia](https://en.wikipedia.org/wiki/Activation_function)