Added README.md

Author: decioferreira

README.md

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+# Elm Graph
+
+A graph data structure library for Elm, inspired by [Haskell Data.Graph](https://hackage.haskell.org/package/containers-0.7/docs/Data-Graph.html). This package implements a finite, directed graph type using an adjacency list representation, where vertices are identified by integers. It also includes an SCC (Strongly Connected Component) type for managing and analyzing strongly-connected components within the graph.
+
+## Getting Started
+
+### Installation
+
+To install the package, run the following:
+
+```bash
+elm install guida-lang/graph
+```
+
+### Usage
+
+Here’s an example of how to use the `Data.Graph` in Elm:
+
+```elm
+import Data.Graph as Graph exposing (Graph)
+
+graphWith3Vertices : Graph
+graphWith3Vertices =
+    let
+        ( graph, nodeFromVertex, vertexFromKey ) =
+            Graph.graphFromEdges [ ( "a", 'a', [ 'b' ] ), ( "b", 'b', [ 'c' ] ), ( "c", 'c', [] ) ]
+    in
+    graph
+```
+
+## Documentation
+
+For full API documentation and more examples, please visit the
+[Elm package documentation](https://package.elm-lang.org/packages/guida-lang/glsl/1.0.0).
+
+## Contributing
+
+Contributions are welcome! If you have ideas for improvements or find bugs, feel free to open an
+issue or submit a pull request.
+
+### To contribute:
+
+1. Fork the repository.
+2. Create a new feature branch.
+3. Commit your changes.
+4. Submit a pull request.