Add a sprinkling more detail to the README

Author: pimterry

README.md

@@ -1,2 +1,5 @@
 # httptoolkit-android
-Automatic interception with HTTP Toolkit, for Android (WIP)
+
+Automatic interception of Android HTTP with [HTTP Toolkit](https://httptoolkit.tech), for inspection, debugging & mocking.
+
+Still in alpha. See https://httptoolkit.tech/docs/guides/android/ for the usage docs.