Add DISCLAIMER file.
diff --git a/DISCLAIMER b/DISCLAIMER
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+Apache Mynewt is an effort undergoing incubation at The Apache Software
+Foundation (ASF), sponsored by the 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.
