events: Add working example for CloudWatch Events (#375)

* events: Add working example for CloudWatch Events

Signed-off-by: Prashanth Pai <prashanth.pai@plivo.com>

* Update README_CloudWatch_Events.md

removed extra empty line

Co-authored-by: Bryan Moffatt <bmoffatt@users.noreply.github.com>

Author: ppai-plivo

events/README_CloudWatch_Events.md

@@ -15,3 +15,24 @@ func handler(ctx context.Context, event events.CloudWatchEvent) {
 	fmt.Printf("Detail = %s\n", event.Detail)
 }
 ```
+
+## CloudWatch Scheduled Events
+
+If you have a constant JSON text in a CloudWatch Scheduled Event, it can be accessed either by explicitly defining a structure for the json payload you would expect:
+
+```go
+type MyRequest struct {
+	Name string `json:"name"`
+}
+
+func handler(ctx context.Context, req MyRequest) {
+}
+```
+
+or by accepting raw json blob as is:
+
+```go
+func handler(ctx context.Context, b json.RawMessage) {
+    // json.RawMessage is basically []byte which can be unmarshalled
+}
+```