n-api,doc: add info about building n-api addons

Adds information about tools available for building N-API addons.

Fixes: https://github.com/nodejs/abi-stable-node/issues/384
PR-URL: https://github.com/nodejs/node/pull/30032


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>