Adding KYC use case notebook (GoogleCloudPlatform#2078)

Author: ljogeiger

.github/actions/spelling/allow.txt

@@ -229,6 +229,7 @@ KFBI
 KNN
 KPIs
 KSA
+KYC
 Kaelen
 Kalamang
 Kamradt
@@ -913,6 +914,7 @@ konnte
 kotlin
 kpi
 kubectl
+kyc
 l'harmonie
 lakecolor
 landcolor