update readme

README.md

@@ -1,3 +1,43 @@
 # Boomerang 🪃
 
-Recurring tasks scheduler for golang implemented on top of [redis](https://redis.io/).
+Simple recurring task scheduler for golang implemented on top of [redis](https://redis.io/).
+
+## Usage
+
+```go
+package main
+
+import (
+    "context"
+    "fmt"
+    "time"
+
+    "github.com/go-redis/redis/v8"
+    "github.com/opsway-io/boomerang"
+)
+
+func main() {
+    ctx := context.Background()
+
+    cli := redis.NewClient(&redis.Options{
+        Addr: "localhost:6379",
+    })
+
+    sch := boomerang.NewSchedule(cli)
+
+    task := boomerang.NewTask(
+        "greeter",
+        "some-unique-id",
+        time.Now().Add(5*time.Second),
+        "Hello!",
+    )
+
+    if err := sch.Add(ctx, task); err != nil {
+        panic(err)
+    }
+
+    sch.On(ctx, "greeter", func(ctx context.Context, task *boomerang.Task) {
+        fmt.Println(task.Data)
+    })
+}
+```