Add DISCLAIMER file required by Apache policy (apache#2916)

nwangtw · kramasamy · commit e4fbfe5854b2 · 2018-06-08T07:24:42.000-07:00
diff --git a/DISCLAIMER b/DISCLAIMER
@@ -0,0 +1,6 @@
+Apache Heron (incubating) is an effort undergoing incubation at The Apache Software Foundation
+(ASF), sponsored by the Apache Incubator PMC. Incubation is required of all newly accepted
+projects until a further review indicates that the infrastructure, communications, and decision
+making process have stabilized in a manner consistent with other successful ASF projects. While
+incubation status is not necessarily a reflection of the completeness or stability of the code,
+it does indicate that the project has yet to be fully endorsed by the ASF.
