add readme

README.md

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+# mac4nick
+
+`mac4nick` is a small and self contained webinterface to manage the MAC address
+assingment for Hackerspace Bamberg members.
+
+It features an option to update existing MAC entries, unlike the existing
+solutions.
+
+## Usage
+
+```sh
+$ mac4nick --help
+Configuration
+
+Options:
+  --listen          listen address
+  --dsn             database dsn
+  --session-secret  session secret
+  --log             debug
+  --help            display usage information
+```