[FLAGON-420,421] add notice, license updates, add disclaimer

DISCLAIMER

@@ -0,0 +1,7 @@
+Apache Flagon is an effort undergoing incubation at The Apache Software Foundation (ASF),
+sponsored by the Apache Incubator project. 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.

LICENSE

@@ -198,4 +198,4 @@
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
-    limitations under the License.
+    limitations under the License.

NOTICE

@@ -3,4 +3,4 @@ Copyright 2019 The Apache Software Foundation
 
 This product includes software developed at The Apache Software Foundation (http://www.apache.org/),
 based on source code originally developed and generously granted to The Apache Software Foundation
-by The Charles Stark Draper Laboratory, Inc (http://www.draper.com/).
+by The Charles Stark Draper Laboratory, Inc (http://www.draper.com/).