add code context

README.md

@@ -5,6 +5,30 @@
 
 # HOW IT WORKS
 
+
+```go
+// It builds an engine based on user inputs
+// {url: url, id: id, sdp: webRTCOffer}
+donutEngine := donut.EngineFor(reqParams)
+// It fetches the server-side (streaming server) stream info (codec, ...)
+serverStreamInfo := donutEngine.ServerIngredients(reqParams)
+// It gets the client side (browser) media support (codec, ...)
+clientStreamInfo := donutEngine.ClientIngredients(reqParams)
+// Given the client's restrictions and the server's availability, it builds the right recipe.
+donutRecipe := donutEngine.RecipeFor(reqParams, serverStreamInfo, clientStreamInfo)
+
+// It streams the media from the backend server to the client while there's data.
+go donutEngine.Serve(DonutParameters{
+	Recipe: donutRecipe,
+	OnVideoFrame: func(data []byte, c MediaFrameContext) error {
+		return SendMediaSample(VIDEO_TYPE, data, c)
+	},
+	OnAudioFrame: func(data []byte, c MediaFrameContext) error {
+		return SendMediaSample(AUDIO_TYPE, data, c)
+	},
+})
+```
+
 ```mermaid
 sequenceDiagram
     actor User