New NOTICE.md file

NOTICE.md

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+This content is produced and maintained by the Eclipse Vert.x project.
+
+* Project home: https://projects.eclipse.org/projects/rt.vertx
+
+Eclipse Vert.x, and Vert.x are trademarks of the Eclipse Foundation. Eclipse,
+and the Eclipse Logo are registered trademarks of the Eclipse Foundation.
+
+## Declared Project Licenses
+
+This program and the accompanying materials are made available under the
+terms of the Eclipse Public License 2.0 which is available at
+http://www.eclipse.org/legal/epl-2.0, or the Apache Software License
+2.0 which is available at https://www.apache.org/licenses/LICENSE-2.0.
+
+SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+
+## Source Code
+
+The project maintains the following source code repositories:
+
+* https://github.com/eclipse/vert.x
+
+## Copyright Holders
+
+_See the header in each individual file._
+
+## Third-party Content
+
+_See the declared runtime dependencies in `pom.xml`._
+
+## Cryptography
+
+Content may contain encryption software. The country in which you are currently
+may have restrictions on the import, possession, and use, and/or re-export to
+another country, of encryption software. BEFORE using any encryption software,
+please check the country's laws, regulations and policies concerning the import,
+possession, or use, and re-export of encryption software, to see if this is
+permitted.