Adds ECCN response statement

Author: yurydelendik

EXPORT

@@ -0,0 +1,5 @@
+PDF.js is publicly available software not subject to the Export Administration
+Regulations (EAR) per EAR 734.3(b) and 734.7. Because PDF.js is not subject
+to the EAR it does not have an Export Control Classification Number (ECCN).
+Mozilla has completed the notification for PDF.js publicly available encryption
+source code per EAR 742.15(b).