Prepare release for v0.5.2

Merge pull-request #11.

Author: terrillmoore

README.md

@@ -1,9 +1,13 @@
 # COLLECTION-mouserat-activity
 
+[![GitHub release](https://img.shields.io/github/release/mcci-catena/COLLECTION-mouserat-activity.svg)](https://github.com/mcci-catena/COLLECTION-mouserat-activity/releases/latest) [![GitHub commits](https://img.shields.io/github/commits-since/mcci-catena/COLLECTION-mouserat-activity/latest.svg)](https://github.com/mcci-catena/COLLECTION-mouserat-activity/compare/v0.5.2...master)
+
 Collection of repos as build environment for Catena 4430 for WUSTL / Lex Kravitz' RAD2 (Rodent Activity Detector, V2).
 
 This corresponds to MCCI document 234001363.
 
+[![Picture of Model 4430 Complete!](assets/catena4430-black-case.jpg)](https://store.mcci.com/products/mcci-catena-4430-activity-sensor-wing)
+
 This repo is intended to be built on Linux (Ubuntu 18 or later). The build script might work with Ubuntu for Windows, but has not been tested.
 
 To build:
@@ -30,6 +34,12 @@ To build:
       ./build-with-cli --key={path-to-file}.pem
       ```
 
+    - to build for 2 MHz clock and hardware serial, for Europe, with the test-signing key:
+
+      ```bash
+      ./build-with-cli.sh --clock=2 --serial=hw --region=eu868 --test
+      ```
+
     - to build for multiple regions and multiple networks:
 
       ```bash