update README.md

README.md

@@ -2,9 +2,88 @@
 
 ![tests](https://github.com/antoine2116/go-choruspro/actions/workflows/tests.yml/badge.svg)
 [![codecov](https://codecov.io/gh/antoine2116/go-choruspro/graph/badge.svg?token=E35WE8EF7Y)](https://codecov.io/gh/antoine2116/go-choruspro)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 go-choruspro is a [Go](https://go.dev/) client library for acessing the [ChorusPro API](https://api.gouv.fr/les-api/chorus-pro).
 
-## 🚧 Under construction 🚧
+> Chorus Pro is the shared invoicing solution that has been set up for all suppliers (private or public) in the public sector (State, local authorities, etc.) to meet the legal requirements for electronic invoicing.
+> (translated from [economie.gouv.fr](https://www.economie.gouv.fr/cedef/chorus-pro-aide#:~:text=Chorus%20Pro%20est%20la%20solution,en%20mati%C3%A8re%20de%20facturation%20%C3%A9lectronique.))
 
-This library is still under construction and is not ready for production use.
+See the [Chorus Pro Community](https://communaute.chorus-pro.gouv.fr/) for more information (documentation, support, status, etc.)
+
+## Installation
+
+```bash
+go get github.com/antoine2116/go-choruspro
+```
+
+## Usage
+
+```go
+import "github.com/antoine2116/go-choruspro"
+```
+
+Construct a new ChorusPro client. You must provide the following parameters:
+
+```go
+cfg := &choruspro.ClientConfig{
+		BaseUrl:      "<piste_url>",
+		AuthUrl:      "<piste_oauth_url>",
+		ClientId:     "<piste_client_id>",
+		ClientSecret: "<piste_client_secret>",
+		Login:        "<chorus_pro_technical_credentials>",
+	}
+
+c, err := choruspro.NewClient().WithConfig(cfg)
+```
+
+### Examples
+
+#### Get the list of currencies available
+
+```go
+res, err := c.Transverses.RecupererDevises(context.Background(), choruspro.CodeLangueFr)
+```
+
+#### Upload an invoice
+
+```go
+invoice := SoumettreFactureOptions{
+  NumeroFactureSaisi: "123456",
+  LignesPoste: &[]SoumettreFactureLignePoste{
+    {
+      Quantite: 1,
+      PrixUnitaire: 100,
+      Designation: "Test",
+      CodeTVA: "TVA20",
+    },
+  },
+}
+
+res, err := c.Factures.SoumettreFacture(context.Background(), invoice)
+```
+
+## Services available
+
+For now, only the following services are available:
+
+- ✅ Factures
+- ✅ Structures
+- ✅ Transverses
+- ✅ Utilisateurs
+- ❌ Engagements
+- ❌ FacturesTravaux
+
+The other services will be added soon (PRs are welcome!)
+
+## Contributing
+
+Contributions are welcome! Please open an issue or submit a pull request.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details
+
+## Disclaimer
+
+This project is not affiliated with the Chorus Pro project or the French government.