formatting and add pro upgrade info

PRO_UPGRADE.txt

@@ -0,0 +1,29 @@
+* * * * * * * * * * * * * * * *
+* * UPGRADE TO SB ADMIN PRO * *
+* * * * * * * * * * * * * * * *
+
+Save $10 and upgrade to SB Admin Pro.
+Use the coupon code:
+
+SAVE10
+
+when making your purchase at
+https://startbootstrap.com/theme/sb-admin-pro.
+
+* * * * * * * * * * * * * * *
+* * SB ADMIN PRO INCLUDES * *
+* * * * * * * * * * * * * * *
+
+- Full Documentation
+- Expanded Components & Utilities
+- Page Examples for Common Web App Views
+- Email Support
+- Fixed and Static Sidenav Options
+- Multiple Page Layout Options
+
+...and more!
+
+Visit https://startbootstrap.com/theme/sb-admin-pro to preview SB Admin Pro!
+
+Save $10 on ANY LICENSE TIER using the following coupon code:
+Coupon Code: SAVE10