Document 3rd party libraries so we know where to update them

package.nw/lib/README-3rdparty.md

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+# Third party source files
+
+## Moment - time-zone manipulation
+
+- https://momentjs.com/downloads/moment-timezone-with-data.js
+- https://momentjs.com/downloads/moment-with-locales.js
+
+## OpenLayers - map display
+
+- https://openlayers.org/
+- https://github.com/openlayers/openlayers/releases/download/v6.4.3/v6.4.3.zip
+- https://github.com/openlayers/openlayers/
+
+- lib/ol.css
+- lib/ol.js
+
+Not entirely part of openlayers, but conglomerated together from other stuff:
+
+- lib/shadow.js
+
+## DatePicker - calendar display
+
+- https://code-boxx.com/simple-datepicker-pure-javascript-css/
+- https://code-boxx.com/wp-content/uploads/2020/06/datepicker-js.zip
+
+- lib/datepicker.js
+- lib/dp-dark.css
+
+Code has been hacked a bit, origin not reflected in version control so be
+careful when upgrading.
+
+## Other Third Party routines
+
+lib/third-party.js
+lib/fw.js -- unused - fireworks when you complete WAS - from Henry N2VFL