Add readme for AI module

Author: opixelum

rust/src/ai/README.md

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+# Opixelib AI Module
+
+## Structure
+
+### Activation
+
+Contains all activation functions.
+
+- [x] Binary step
+- [ ] ELU
+- [ ] Gaussian
+- [ ] GELU
+- [ ] Identity
+- [x] Leaky ReLU
+- [ ] PReLU
+- [ ] Probit
+- [x] ReLU
+- [ ] SELU
+- [ ] Sigmoid
+- [ ] SiLU
+- [ ] SMHT
+- [x] Softmax
+- [ ] Softplus
+- [ ] Softsign
+- [ ] TanH
+
+### Data
+
+Contains functions for extracting, preparing and processing data.
+
+### Layer
+
+Contains all types of layer used in neural networks.
+
+- [ ] Convolution
+- [ ] Dense
+- [ ] Dropout
+- [ ] Flatten
+- [ ] Pooling
+- [ ] Recurrent
+
+### Loss
+
+Contains all loss functions.
+
+- [ ] MSE
+- [ ] MAE
+- [ ] XC
+
+### Model
+
+Contains functions for defining and compiling neural networks.
+
+### Neuron
+
+Contains the structure of a neuron with its related methods.
+
+### Optimizer
+
+Contains all optimizer functions.
+
+- [ ] Adam
+- [ ] GD
+- [ ] RMSprop
+- [ ] SGD