Add a README.md for Github

README.md

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+Nmap [![Build Status](https://travis-ci.org/nmap/nmap.svg?branch=master)](https://travis-ci.org/nmap/nmap)
+====
+
+Nmap is released under a GPL-style license, the full text of which is available
+in [the COPYING file](COPYING).
+
+The latest version of this software as well as binary installers for Windows,
+macOS, and Linux (RPM) are available from https://nmap.org/
+
+Full documentation is also available
+[on the Nmap.org website](https://nmap.org/docs.html).
+
+Questions and suggestions may be sent to
+[the Nmap-dev mailing list](https://nmap.org/mailman/listinfo/dev).
+
+Installing
+----------
+Ideally, you should be able to just type:
+
+    ./configure
+    make
+    make install
+
+For far more in-depth compilation, installation, and removal notes, read the
+[Nmap Install Guide](https://nmap.org/book/install.html) on Nmap.org.
+
+Using Nmap
+----------
+Nmap has a lot of features, but getting started is as easy as running `nmap
+scanme.nmap.org`. Running `nmap` without any parameters will give a helpful
+list of the most common options, which are discussed in depth in [the man
+page](https://nmap.org/book/man.html). Users who prefer a graphical interface
+can use the included [Zenmap front-end](https://nmap.org/zenmap/).
+
+Contributing
+------------
+Information about filing bug reports and contributing to the Nmap project can
+be found in the [HACKING](HACKING) and [CONTRIBUTING.md](CONTRIBUTING.md)
+files.