Add readme and license

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+# Identicons
+
+A tiny implementation of
+[identicons](https://en.wikipedia.org/wiki/Identicon), similar to the
+ones used by GitHub for new avatars.
+
+## Dependencies
+
+This library is totally self-contained, there are no 3rd party
+dependencies. It is built and published for Scala on JVM, JS and
+Native.
+
+```sbt
+"io.crashbox" %%% "identicon" % "<unreleased>"
+```
+
+## Usage
+
+```scala
+// generate identicon for user "admin" in SVG form
+identicon.svg("admin") // = <svg width="5" height="5"><rect x="0" y="3" ...
+
+// in base64 data url form
+identicon.url("admin") // = data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0...
+
+```
+
+See the [online generator](https://jakob.odersky.com/identicon) for an
+interactive preview. The generator is simply a static site that uses
+the ScalaJS version of this library.