Add readme to explain project state

readme.md

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+# Gitlab runner gateway
+
+This aims of this repository is to catch gitea webhook, parse .gitlab-ci.yml file and run some job with gitlab-runner from docker container. Some documentation about [gitlab-runner](./misc/doc-gitlab-runner.md)
+
+This API could be compile with graalVM to native image see [Makefile](./Makefile)