doc: add section for strategic initiatives

Add reference to strategic initiatives on core README.md
in order to ensure broarder visibility.

PR-URL: https://github.com/nodejs/node/pull/17104
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

README.md

@@ -591,6 +591,7 @@ Previous releases may also have been signed with one of the following GPG keys:
 
 * [Contributing to the project][]
 * [Working Groups][]
+* [Strategic Initiatives][]
 
 [Code of Conduct]: https://github.com/nodejs/admin/blob/master/CODE_OF_CONDUCT.md
 [Contributing to the project]: CONTRIBUTING.md
@@ -598,4 +599,5 @@ Previous releases may also have been signed with one of the following GPG keys:
 [Node.js Website]: https://nodejs.org/en/
 [Questions tagged 'node.js' on StackOverflow]: https://stackoverflow.com/questions/tagged/node.js
 [Working Groups]: https://github.com/nodejs/TSC/blob/master/WORKING_GROUPS.md
+[Strategic Initiatives]: https://github.com/nodejs/TSC/blob/master/Strategic-Initiatives.md
 [#node.js channel on chat.freenode.net]: https://webchat.freenode.net?channels=node.js&uio=d4