add Usage section and more info

README.md

@@ -2,7 +2,18 @@
 
 you know, for privacy, peoples :)
 
-## references
+## Usage
+Use like this in your JS files:
+```js
+import $ from 'https://esm.archive.org/jquery'
+import dayjs from 'https://esm.archive.org/dayjs'
+
+// semvar works, too, like `npm` and `package.json`
+import $ from 'https://esm.archive.org/jquery@^3.0.0'
+```
+@see https://esm.sh for more usage and examples
+
+## References
 - @see https://github.com/alephjs/esm.sh/blob/master/HOSTING.md
 - @see https://github.com/alephjs/esm.sh/blob/master/Dockerfile