Add mention of develop branch to (#1207)

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@@ -34,6 +34,12 @@
 See [pico-examples]( for example code you can build.
+# Getting the latest SDK code
+The [master]( branch of `pico-sdk` on GitHub contains the 
+_latest stable release_ of the SDK. If you need or want to test upcoming features, you can try the
+[develop]( branch instead.
 # Quick-start your own project
 These instructions are extremely terse, and Linux-based only. For detailed steps,