Add a readme file to the old file location

Felicity Chapman · Felicity Chapman · commit 6317c8668a68 · 2019-08-07T12:57:57.000+01:00
diff --git a/change-notes/support/README.md b/change-notes/support/README.md
@@ -0,0 +1,6 @@
+# Files moved to ``docs`` directory
+
+Now that all the QL documentation is in the `Semmle/ql` repository,
+notes on the languages, compilers and frameworks supported have moved.
+They're now stored as part of the Sphinx support project with the other documentation:
+``docs/ql-documentation/support``.
