Add information regarding Apple Silicon

apple-silicon.md

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+# Building MQ container for Apple Silicon (ARM64)
+Build it locally
+```bash
+git clone https://github.com/ibm-messaging/mq-container.git
+cd mq-container
+make build-devserver
+```
+
+Look at the output - specifically the last line.
+```bash
+...
+ => => naming to docker.io/library/ibm-mqadvanced-server-dev:9.3.5.1-arm64                                                                      0.0s
+```
+
+Use this image instead of the one from icr.io 
+
+~~icr.io/ibm-messaging/mq:9.3.5.1-r1~~
+
+docker.io/library/ibm-mqadvanced-server-dev:9.3.5.1-amd64
+
+Return to [readme.md](readme.md).
+
+## Building a newer/older version
+Edit the version number in `config.env`.
+
+If IBM released a newer versinon, you might also pull down changes from github.
+
+```bash
+cd mq-container
+git pull
+```