Update readme

README.md

@@ -1,3 +1,47 @@
 # gocm
 
-[![Go](https://github.com/jjideenschmiede/gocm/actions/workflows/go.yml/badge.svg)](https://github.com/jjideenschmiede/gocm/actions/workflows/go.yml) [![Go Report Card](https://goreportcard.com/badge/github.com/jjideenschmiede/gocm)](https://goreportcard.com/report/github.com/jjideenschmiede/gocm)
+[![Go](https://github.com/jjideenschmiede/gocm/actions/workflows/go.yml/badge.svg)](https://github.com/jjideenschmiede/gocm/actions/workflows/go.yml) [![Go Report Card](https://goreportcard.com/badge/github.com/jjideenschmiede/gocm)](https://goreportcard.com/report/github.com/jjideenschmiede/gocm) [![Go Doc](https://godoc.org/github.com/jjideenschmiede/gocm?status.svg)](https://pkg.go.dev/github.com/jjideenschmiede/gocm)
+
+With this small library it should be possible to send SMS, WhatsApp & Co messages via [cm.com](https://www.cm.com/de-de/). And, of course, to make other functions of the API usable.
+
+## Business Messaging
+
+In order to send one, or more messages via the Business Messages API, you can use the following function. Here you can find an additional description from the manufacturer.
+
+Currently the following channels can be used: **WhatsApp, Push, RCS, Viber, SMS**
+
+```go
+// Define body
+body := MessageBody{
+    Messages: MessageBodyMessages{
+        Authentication: MessageBodyAuthentication{
+            Producttoken: "",
+        },
+        Msg: []MessageBodyMsg{},
+    },
+}
+
+// Create a message
+body.Messages.Msg = append(body.Messages.Msg, MessageBodyMsg{
+    AllowedChannels: []string{"SMS"},
+    From:            "Test",
+    To:              []MessageBodyTo{},
+    Body: MessageBodyBody{
+        Type:    "auto",
+        Content: "Test message",
+    },
+})
+
+// Add receiver
+body.Messages.Msg[0].To = append(body.Messages.Msg[0].To, MessageBodyTo{
+    Number: "004941521234567",
+})
+
+// Send message
+message, err := Message(body)
+if err != nil {
+    fmt.Println(err)
+} else {
+    fmt.Println(message)
+}
+```