docs: Udate ReadMe

Author: rschristian

README.md

@@ -1,3 +1,13 @@
-# `create-preact`
+# create-preact
 
-TODO: Actually, ya know, document it
+Create a Vite-powered Preact app in seconds
+
+## Usage
+
+```sh
+npm init preact
+```
+
+## License
+
+[MIT](https://github.com/preactjs/create-preact/blob/master/LICENSE)