Add Snyk policy file (neo4j#1033)

Author: bigmontz

.snyk

@@ -0,0 +1,9 @@
+# Snyk (https://snyk.io) policy file
+exclude:
+ global:
+ - packages/testkit-backend/**
+ - testkit/**
+ - packages/core/test/**
+ - packages/bolt-connection/test/**
+ - packages/neo4j-driver-lite/test/**
+ - packages/neo4j-driver/test/**