odk: Add hint to test this in instdir/sdk

Change-Id: I8881f33a024cb5b9e36d4a6a668d8a32aea2ed1a
Reviewed-on: https://gerrit.libreoffice.org/70189
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Tested-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
diff --git a/odk/README b/odk/README
index 5a8dd16..4370e63 100644
--- a/odk/README
+++ b/odk/README
@@ -6,6 +6,8 @@ Part of the SDK; to build you need to add --enable-odk.
Testing the examples:
=====================

* Go to instdir/sdk (Don't try directly in odk/)

* See <https://api.libreoffice.org/docs/install.html> how to set up the SDK.

** When asked about it during configuration, tell the SDK to do automatic