Add top-level .htaccess file.

Change-Id: Id8c56627df4724413101734fe2be59f6e940f31d
diff --git a/.htaccess b/.htaccess
new file mode 100644
index 0000000..0155c32
--- /dev/null
+++ b/.htaccess
@@ -0,0 +1,6 @@
+<Files missingchars.ini>
+  ForceType 'text/plain; charset=UTF-8'
+</Files>
+<Files update.php>
+  Deny from all
+</Files>