doc: update readme (#2153)
doc: update readme (#2153)

Add link to "How to Build Fast, Advanced JSON-Powered Forms on Angular With ngx-formly"
ngx-formly/ngx-formly,formly-js/ng-formly,ngx-formly/ngx-formly,ngx-formly/ngx-formly,formly-js/ng-formly,ngx-formly/ngx-formly