docs: how to handle events in a specific model

tutorials/patterns/README.md

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+# Common Patterns in Bubble Tea
+
+So you've started building your app, but now you're not sure if you're doing
+things the "right way". 
+
+Well thankfully, we have some common patterns that we see when building Bubble
+Tea applications that should help to simplify your decision-making.
+
+## I only want the model that triggered the message to update
+
+To figure out whether a component should process the message or not, simply
+include an ID in the message. The ID will match the ID field of your child
+model and can be handled in that child model's `Update`.
+
+We use this pattern in our [spinner example](https://github.com/charmbracelet/bubbles/blob/master/spinner/spinner.go)
+
+These spots in particular:
+https://github.com/charmbracelet/bubbles/blob/master/spinner/spinner.go#L145-L149
+
+```go
+		// If an ID is set, and the ID doesn't belong to this spinner, reject
+		// the message.
+		if msg.ID > 0 && msg.ID != m.id {
+			return m, nil
+		}
+```
+
+https://github.com/charmbracelet/bubbles/blob/master/spinner/spinner.go#L164
+https://github.com/charmbracelet/bubbles/blob/master/spinner/spinner.go#L195-L203l
+
+```go
+func (m Model) tick(id, tag int) tea.Cmd {
+	return tea.Tick(m.Spinner.FPS, func(t time.Time) tea.Msg {
+		return TickMsg{
+			Time: t,
+			ID:   id,
+			tag:  tag,
+		}
+	})
+}
+```