Add the DISCLAIMER file for Apache incubator project (#952)

Partially-closes: apache/incubator-openwhisk-release#180
diff --git a/DISCLAIMER.txt b/DISCLAIMER.txt
new file mode 100644
index 0000000..dcf0237
--- /dev/null
+++ b/DISCLAIMER.txt
@@ -0,0 +1 @@
+Apache OpenWhisk Whisk Deploy(wskdeploy) is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. 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.
diff --git a/README.md b/README.md
index f576174..4df08c5 100644
--- a/README.md
+++ b/README.md
@@ -244,3 +244,7 @@
 
 Committers can find instructions on how to create tagged releases here:
 - [creating_tagged_releases.md](https://github.com/apache/incubator-openwhisk-wskdeploy/tree/master/docs/creating_tagged_releases.md)
+
+# Disclaimer
+
+Apache OpenWhisk Whisk Deploy(wskdeploy) is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. 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.