Add example config files.

These example configuration files should provide a good start on how to
configure passfilt.

passfilt-server/config/passfilt.service.example

@@ -0,0 +1,14 @@
+[Unit]
+Description=Password filtering daemon
+After=network.target
+
+[Service]
+Type=simple
+User=www-data
+WorkingDirectory=/opt/passfilt
+RuntimeDirectory=passfilt
+ExecStart=/opt/passfilt/bin/passfilt
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target

passfilt-server/config/sites-available-passfilt.example

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+server {
+	listen 0.0.0.0:443;
+	server_name passfilt.local;	
+
+	ssl_certificate		/etc/nginx/cert.crt;
+	ssl_certificate_key	/etc/nginx/cert.key;
+
+	ssl on;
+
+	location / {
+		proxy_pass http://unix:/var/run/passfilt/passfilt.socket:/;
+		proxy_pass_request_headers on;
+	}
+}