Add README.md

It is shorter than the current README.pod (man page), to which it
links. In addition to the man page, it contains installation
instructions and links to server-side documentation.

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+# Novaboot
+
+Novaboot is a tool that automates booting of operating systems on
+target hardware (typically embedded boards) or in Qemu. Initially, it
+was developed to boot [NOVA Microhypervisor](http://hypervisor.org/)
+(hence the name), but nowadays is well suited for booting
+[Linux](https://www.kernel.org/) (and perhaps other OSes) too.
+
+## Instalation
+
+The simplest way to install novaboot is to install `perl` and its
+packages `IO-Stty` and `Expect` and copy the
+[novaboot](server/novaboot-shell.pod) script somewhere to your $PATH.
+
+You can also install everything (including man pages) by:
+
+    make install
+
+To install the optional server part (see below), run:
+
+    make -C server install
+
+## Documentation
+
+Novaboot can be used in variety of setups. Most typical ones are
+depicted in the figure below.
+
+![Possible novaboot setups](doc/typical-setups.svg?raw=true "Title")
+
+The setups are fully described in the [documentation](./README.pod),
+but in short: Setup A is for power users, who can configure everything
+themselves, whereas setup C is useful for students, who just want to
+access the target device with as little configuration on their side as
+possible.
+
+### Client side
+
+- novaboot [documentation](./README.pod)
+
+### Server-side (optional, needed only by server administrators for setup C)
+
+- [novaboot-shell](server/novaboot-shell.pod)
+- [adduser-novaboot](server/adduser-novaboot.pod)