Build instructions

[kuba-orlik]

I've tried building the lib with npm run build, but linking to it locally gives errors like:

(node:24207): GLib-GObject-WARNING **: 14:21:38.601: cannot register existing type 'NUContainer'

(node:24207): GLib-GObject-WARNING **: 14:21:38.601: cannot add private field to invalid (non-instantiatable) type '<invalid>'

(node:24207): GLib-CRITICAL **: 14:21:38.601: g_once_init_leave: assertion 'result != 0' failed

(node:24207): GLib-GObject-CRITICAL **: 14:21:38.602: g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' failed

Are there some more build steps to achieve a working version that I can locally link to?