Add README.md

Signed-off-by: Kaur Palang <kaur.palang@brightcodecompany.com>

Author: kpalang

README.md

@@ -0,0 +1,7 @@
+# Open Integration Engine Container registry
+
+## Build Thing
+To build the full set of four images (`ubuntu-jre`, `ubuntu-jdk`, `alpine-jre`, and `alpine-jdk`) run the following command in the `deploy/` directory:
+```sh
+docker compose build --build-arg CREATED_AT=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+```