Update robots.txt

Change-Id: Ia5944b06b5f33fc92c9dfd5a81836f23570e5c4f
diff --git a/public/robots.txt b/public/robots.txt
new file mode 100644
index 0000000..2c03631
--- /dev/null
+++ b/public/robots.txt
@@ -0,0 +1,11 @@
+# robots.txt only applies, when KorAP is accessible
+# from the domain root.
+
+User-agent: *
+Disallow: /api/
+Disallow: /css/
+Disallow: /font/
+Disallow: /js/
+Disallow: /settings/
+Disallow: /corpus/
+Disallow: /gerrit/