Create THIRD_PARTY_NOTICE.md (#5)

Author: odow

THIRD_PARTY_NOTICE.md

@@ -0,0 +1,10 @@
+# Third Party Licenses and acknowledgements
+
+This package uses third party packages.
+
+The Xpress artifacts that are automatically downloaded on install are governed
+by the [Xpress Shrinkwrap License Agreement](https://community.fico.com/s/contentdocument/06980000002h0i5AAA).
+When installing `Xpress_jll`, you accept the shrinkwrap license terms.
+
+A copy of the Xpress Shrinkwrap License is stored in the file `LICENSE.txt` in
+the dist-info directory of the installed artifact.