tools: nfd-status-http-server: serve XML

refs #1690

Change-Id: Ie5de0b8e5041f91cf9bdf1ec7e2c24cde5ffbe38
diff --git a/tools/nfd-status-http-server-files/robots.txt b/tools/nfd-status-http-server-files/robots.txt
new file mode 100644
index 0000000..1f53798
--- /dev/null
+++ b/tools/nfd-status-http-server-files/robots.txt
@@ -0,0 +1,2 @@
+User-agent: *
+Disallow: /