add Generating samples to contributing #861

Job	Run time
build-matrix	9s
ngx-default	1m 50s
ngx-default-additional	1m 39s
ngx-mongodb-kafka-cucumber	1m 29s
ngx-gradle-fr	1m 28s
ngx-gradle-h2disk-ws-nocache	1m 22s
ngx-webflux-mongodb	1m 17s
ngx-webflux-gradle-mongodb-oauth2	1m 39s
ngx-webflux-psql-default	1m 24s
ngx-webflux-psql-additional	1m 4s
ngx-webflux-gradle-session-h2mem-es	1m 14s
ms-ngx-oauth2-mongodb-caffeine	1m 44s
mf-ngx-eureka-jwt-psql-ehcache	1m 47s
ms-mf-ngx-consul-oauth2-neo4j	1m 43s
check-angular	1s
	19m 50s

Provide feedback