Add README.md

A README.md allows us to include a badge for the current build status of
Semaphore CI. Keep other information in this file minimal, and avoid
information duplication but point readers to the official README.

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+# systemd - System and Service Manager
+
+[![Build Status](https://semaphoreci.com/api/v1/projects/28a5a3ca-3c56-4078-8b5e-7ed6ef912e14/443470/shields_badge.svg)](https://semaphoreci.com/systemd/systemd)
+
+## Details
+
+ * General information about systemd can be found in the [systemd Wiki](http://www.freedesktop.org/wiki/Software/systemd)
+ * Information about build requirements are provided in the [README file](../master/README)