make wandb optional, update readme install instructions

Author: sfluegel05

README.md

@@ -5,7 +5,12 @@ The library emphasizes the incorporation of the semantic qualities of the ontolo
 
 ## Installation
 
-To install ChEBai, follow these steps:
+You can install ChEBai via pip:
+```
+pip install chebai
+```
+
+Alternatively, you can get the latest development version directly from GitHub:
 
 1. Clone the repository:
 ```
@@ -16,8 +21,26 @@ git clone https://github.com/ChEB-AI/python-chebai.git
 
 ```
 cd python-chebai
-pip install .
+pip install -e .
+```
+
+Some packages are not installed by default:
+```
+pip install chebai[dev]
+```
+installs additional packages useful to people who want to contribute to the library.
+```
+pip install chebai[plot]
+```
+installs additional packages useful for plotting and visualisation.
+```
+pip install chebai[wandb]
+```
+installs the [Weights & Biases](https://wandb.ai) integration for automated logging of training runs.
+```
+pip install chebai[all]
 ```
+installs all optional dependencies.
 
 ## Usage
 

pyproject.toml

@@ -9,6 +9,9 @@ description = "ChEBai is a deep learning library designed for the integration of
 authors = [
     { name = "MGlauer", email = "[email protected]" }
 ]
+maintainers = [
+    { name = "sfluegel05", email = "[email protected]"}
+]
 readme = "README.md"
 license = { text = "AGPL-3.0" }
 requires-python = ">=3.9,<3.13"
@@ -30,12 +33,13 @@ dependencies = [
     "omegaconf",
     "deepsmiles",
     "iterative-stratification",
-    "wandb",
     "torchmetrics"
 ]
 
 [project.optional-dependencies]
-dev = ["black", "isort", "pre-commit", "matplotlib", "seaborn"]
+dev = ["black", "isort", "pre-commit"]
+plot = ["matplotlib", "seaborn"]
+wandb = ["wandb"]
 
 [tool.setuptools]
 include-package-data = true