Better monorepo index

Author: aurorarossi

GraphNeuralNetworks/docs/src/index.md

@@ -15,6 +15,49 @@ Here is a schema of the dependencies between the packages:
 ![Monorepo schema](assets/schema.png)
 
 
+Among its general features:
+
+* Implements common graph convolutional layers both in stateful and stateless form.
+* Supports computations on batched graphs. 
+* Easy to define custom layers.
+* CUDA support.
+* Integration with [Graphs.jl](https://github.com/JuliaGraphs/Graphs.jl).
+* [Examples](https://github.com/JuliaGraphs/GraphNeuralNetworks.jl/tree/master/examples) of node, edge, and graph level machine learning tasks. 
+* Heterogeneous and temporal graphs. 
+
+## Installation
+
+GraphNeuralNetworks.jl, GNNlib.jl and GNNGraphs.jl are a registered Julia packages. You can easily install a package, for example GraphNeuralNetworks.jl, through the package manager :
+
+```julia
+pkg> add GraphNeuralNetworks
+```
+
+## Usage
+
+Usage examples can be found in the [examples](https://github.com/JuliaGraphs/GraphNeuralNetworks.jl/tree/master/GraphNeuralNetworks/examples) and in the [notebooks](https://github.com/JuliaGraphs/GraphNeuralNetworks.jl/tree/master/GraphNeuralNetworks/notebooks) folder. Also, make sure to read the [documentation](https://juliagraphs.org/GraphNeuralNetworks.jl/graphneuralnetworks/) for a comprehensive introduction to the library and the [tutorials](https://juliagraphs.org/GraphNeuralNetworks.jl/tutorials/).
+
+
+## Citing
+
+If you use GraphNeuralNetworks.jl in a scientific publication, we would appreciate the following reference:
+
+```
+@misc{Lucibello2021GNN,
+  author       = {Carlo Lucibello and other contributors},
+  title        = {GraphNeuralNetworks.jl: a geometric deep learning library for the Julia programming language},
+  year         = 2021,
+  url          = {https://github.com/JuliaGraphs/GraphNeuralNetworks.jl}
+}
+```
+
+## Acknowledgments
+
+GraphNeuralNetworks.jl is largely inspired by [PyTorch Geometric](https://pytorch-geometric.readthedocs.io/en/latest/), [Deep Graph Library](https://docs.dgl.ai/),
+and [GeometricFlux.jl](https://fluxml.ai/GeometricFlux.jl/stable/).
+
+
+