Update README.md

README.md

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 # OPNsense-Captive-Portal
 A nice themed OPNsense Captive Portal
+
+## Setup Instructions
+Setup Instructions can be found on the [Opnsense Wiki - Captive portal & GuestNET](https://wiki.opnsense.org/manual/captiveportal.html) and on [Opnsense Wiki - Setup a Guest Network](https://wiki.opnsense.org/manual/how-tos/guestnet.html)
+
+## Screenshots
+
+### Login Portal
+![Login](/screenshots/template_1.png)
+
+### Login Portal Mobile
+![Responsive](/screenshots/template_1_responsive.png)
+
+### Session Display
+![Session Screen](/screenshots/template_session.png)