Update README.md

adding faq to readme

User_Manual/README.md

@@ -24,10 +24,10 @@ EPANET has an active open source software community including consulting enginee
 Finally, the issues identified and resolved here were the result of U.S. EPA's efforts to coordinate beta testing of the EPA/OWA EPANET version 2.2.0.  
 
 # Documentation
-An EPANET User's Manual is available for download here at https://github.com/USEPA/EPANET2.2/tree/master/User_Manual.
+An EPANET User's Manual is available for download here at https://github.com/USEPA/EPANET2.2/tree/master/User_Manual. A frequently asked questions (FAQ) document is also available at https://github.com/USEPA/EPANET2.2/blob/master/User_Manual/EPANET%20FAQ.pdf.
 
 # Contact
 [email protected]
 
 # EPA Disclaimer
-The United States Environmental Protection Agency (EPA) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. EPA has relinquished control of the information and no longer has responsibility to protect the integrity, confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.
+The United States Environmental Protection Agency (EPA) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. EPA has relinquished control of the information and no longer has responsibility to protect the integrity, confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.