Update readme

Author: nseidle

README.md

@@ -7,21 +7,26 @@ The line of RTK Everywhere products offered by SparkFun all run identical firmwa
 	<tr align="center">
 		<td><a href="https://www.sparkfun.com/products/25662"><img src="docs/img/SparkFun_RTK_Torch.png"></a></td>
 		<td><a href="https://www.sparkfun.com/products/24342"><img src="docs/img/SparkFun_RTK_EVK.png"></a></td>
+		<td><a href="https://www.sparkfun.com/sparkfun-rtk-postcard.html"><img src="docs/img/SparkFun_RTK_Postcard.png"></a></td>
 	</tr>
 	<tr align="center">
 		<td><a href="https://www.sparkfun.com/products/25662">SparkFun RTK Torch (GPS-25662)</a></td>
 		<td><a href="https://www.sparkfun.com/products/24342">SparkFun RTK EVK (GPS-24342)</a></td>
+		<td><a href="https://www.sparkfun.com/sparkfun-rtk-postcard.html">SparkFun RTK Postcard (GPS-26916)</a></td>
 	</tr>
 	<tr align="center">
 		<td><a href="https://docs.sparkfun.com/SparkFun_RTK_Torch/">Hookup Guide</a></td>
 		<td><a href="https://docs.sparkfun.com/SparkFun_RTK_EVK/">Hookup Guide</a></td>
+		<td><a href="https://docs.sparkfun.com/SparkFun_RTK_Postcard/">Hookup Guide</a></td>
 	</tr>
 </table>
 
 The [SparkFun RTK Torch](https://www.sparkfun.com/products/25662) is a centimeter-level GNSS receiver. With RTK enabled, these devices can output your location with 8mm horizontal and vertical [*accuracy*](https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/accuracy_verification/) at up to 20Hz. It supports Galileo E6 HAS and has built-in tilt compensation too!
 
 The [SparkFun RTK EVK](https://www.sparkfun.com/products/24342) is the perfect development platform for your fixed or mobile high-precision positioning and navigation needs. We called it the EVK (Evaluation Kit) as it truly covers all the options: L1 + L2 RTK GNSS, with L-Band correction built-in. Regarding connectivity, the SparkFun RTK EVK has it all: WiFi / Bluetooth®, Ethernet and LTE cellular!
 
+The [SparkFun RTK Postcard](https://www.sparkfun.com/products/26916) is a scalable DIY RTK device capable of running the RTK Everywhere Firmware. The LG290P RTK module lives at the heart of the RTK Postcard providing 10mm accuracy and L1/L2/L5 reception. Add the [Portability Shield](https://www.sparkfun.com/sparkfun-portability-shield.html) to add a display, battery charging and logging.
+
 This repo houses the [RTK Product Manual](https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware) and the firmware that runs on the SparkFun RTK product line including:
 
 * [SparkFun RTK Torch](https://www.sparkfun.com/products/25662)

docs/img/SparkFun RTK Postcard.png

@@ -29,8 +29,17 @@ The line of RTK Everywhere products offered by SparkFun all run identical firmwa
 	[Hookup Guide](https://docs.sparkfun.com/SparkFun_RTK_EVK/){ .md-button .md-button--primary }
 	</center>
 
-</div>
+-   <figure markdown>
+	[![Product Image](./img/SparkFun_RTK_Postcard.png)](https://www.sparkfun.com/sparkfun-rtk-postcard.html "Go to Product Page")
+	<figcaption markdown>
+	[SparkFun RTK Postcard (GPS-26916)](https://www.sparkfun.com/sparkfun-rtk-postcard.html)
+	</figcaption>
+	</figure>
 
+	<center>
+	[Hookup Guide](https://docs.sparkfun.com/SparkFun_RTK_Postcard/){ .md-button .md-button--primary }
+	</center>
+</div>
 
 Depending on the hardware platform different features may or may not be supported. We will denote each product in each section so that you know what is supported.