Add license.md for amazonlinux

amazonlinux/license.md

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+Amazon Linux is available under the [GNU General Public License, version 2.0](https://github.com/aws/amazon-linux-docker-images/blob/master/LICENSE). Individual software packages are available under their own licenses; run `rpm -qi [package name]` or check `/usr/share/doc/[package name]-*` and `/usr/share/licenses/[package name]-*` for details.