docs(README): add playground

README.md

@@ -20,7 +20,7 @@ Find and replace all on all files (CMD+SHIFT+F):
 [Nuxt][nuxt-href] integration for [SplitType](https://github.com/lukepeavey/SplitType).
 
 - [✨  Release Notes](/CHANGELOG.md)
-<!-- - [🏀 Online playground](https://stackblitz.com/github/your-org/nuxt-split-type?file=playground%2Fapp.vue) -->
+- [🏀 Online playground](https://codesandbox.io/p/devbox/charming-leaf-3mct89?layout=%257B%2522sidebarPanel%2522%253A%2522EXPLORER%2522%252C%2522rootPanelGroup%2522%253A%257B%2522direction%2522%253A%2522horizontal%2522%252C%2522contentType%2522%253A%2522UNKNOWN%2522%252C%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522id%2522%253A%2522ROOT_LAYOUT%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522UNKNOWN%2522%252C%2522direction%2522%253A%2522vertical%2522%252C%2522id%2522%253A%2522clr3qtcdc00073b6h4wunverv%2522%252C%2522sizes%2522%253A%255B70%252C30%255D%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522EDITOR%2522%252C%2522direction%2522%253A%2522horizontal%2522%252C%2522id%2522%253A%2522EDITOR%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522EDITOR%2522%252C%2522id%2522%253A%2522clr3qtcdc00023b6ht7nocw3j%2522%257D%255D%257D%252C%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522SHELLS%2522%252C%2522direction%2522%253A%2522horizontal%2522%252C%2522id%2522%253A%2522SHELLS%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522SHELLS%2522%252C%2522id%2522%253A%2522clr3qtcdc00043b6hn5bwdnw6%2522%257D%255D%252C%2522sizes%2522%253A%255B100%255D%257D%255D%257D%252C%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522DEVTOOLS%2522%252C%2522direction%2522%253A%2522vertical%2522%252C%2522id%2522%253A%2522DEVTOOLS%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522DEVTOOLS%2522%252C%2522id%2522%253A%2522clr3qtcdc00063b6h1609gb2f%2522%257D%255D%252C%2522sizes%2522%253A%255B100%255D%257D%255D%252C%2522sizes%2522%253A%255B50%252C50%255D%257D%252C%2522tabbedPanels%2522%253A%257B%2522clr3qtcdc00023b6ht7nocw3j%2522%253A%257B%2522tabs%2522%253A%255B%257B%2522id%2522%253A%2522clr3qtcdc00013b6ho7x1scje%2522%252C%2522mode%2522%253A%2522permanent%2522%252C%2522type%2522%253A%2522FILE%2522%252C%2522filepath%2522%253A%2522%252FREADME.md%2522%257D%255D%252C%2522id%2522%253A%2522clr3qtcdc00023b6ht7nocw3j%2522%252C%2522activeTabId%2522%253A%2522clr3qtcdc00013b6ho7x1scje%2522%257D%252C%2522clr3qtcdc00063b6h1609gb2f%2522%253A%257B%2522id%2522%253A%2522clr3qtcdc00063b6h1609gb2f%2522%252C%2522tabs%2522%253A%255B%257B%2522id%2522%253A%2522clr3qtcdc00053b6hn5in815l%2522%252C%2522mode%2522%253A%2522permanent%2522%252C%2522type%2522%253A%2522TASK_PORT%2522%252C%2522taskId%2522%253A%2522dev%2522%252C%2522port%2522%253A3000%252C%2522path%2522%253A%2522%252F%2522%257D%255D%252C%2522activeTabId%2522%253A%2522clr3qtcdc00053b6hn5in815l%2522%257D%252C%2522clr3qtcdc00043b6hn5bwdnw6%2522%253A%257B%2522id%2522%253A%2522clr3qtcdc00043b6hn5bwdnw6%2522%252C%2522activeTabId%2522%253A%2522clr3r7t3h00wf3b6hgv4d7ahy%2522%252C%2522tabs%2522%253A%255B%257B%2522type%2522%253A%2522TASK_LOG%2522%252C%2522taskId%2522%253A%2522dev%2522%252C%2522id%2522%253A%2522clr3r7t3h00wf3b6hgv4d7ahy%2522%252C%2522mode%2522%253A%2522permanent%2522%257D%255D%257D%257D%252C%2522showDevtools%2522%253Atrue%252C%2522showShells%2522%253Atrue%252C%2522showSidebar%2522%253Atrue%252C%2522sidebarPanelSize%2522%253A15%257D)
 - [📖 &nbsp;Documentation](#usage)
 
 ## Features