added badges to readme and site

Author: Claudenw

README.md

@@ -18,6 +18,8 @@
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 ======================
 
+[![Main push checks](https://github.com/Aiven-Open/kafka-config/actions/workflows/Merge_check.yml/badge.svg)](https://github.com/Aiven-Open/kafka-config/actions/workflows/Merge_check.yml)
+
 Overview
 ========
 `kafka-config` is a collection of utilities to make configuring and documenting Kafka components easier.

src/site/markdown/index.md

@@ -18,6 +18,8 @@
 -->
 # Aiven Commons Kafka Config (kafka-config)
 
+[![Main push checks](https://github.com/Aiven-Open/kafka-config/actions/workflows/Merge_check.yml/badge.svg)](https://github.com/Aiven-Open/kafka-config/actions/workflows/Merge_check.yml)
+
 `kafka-config` is a collection of utilities to make configuring and documenting Kafka components easier.