Create v1.9.0 branch

and add blog

content/en/blog/releases/iam-1_9_0.md

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+---
+date: 2024-06-19
+linkTitle: "IAM v1.9.0"
+title: "IAM v1.9.0"
+description: "The v1.9.0 release focuses on better management of the Virtual Organization (VO)"
+author: IAM development team
+---
+
+The IAM development team is pleased to announce the release of INDIGO IAM v1.9.0.
+
+This release introduces new features, including:
+
+* Administrators have the ability to disable a client
+* VO members can re-sign the AUP whenever they choose
+* Clients now have a _last used_ property to find out when was the last time it was used
+* It is now possible to add a _nickname_ as an attribute during the registration process
+
+This release also provides bug fixes and enhancements, as can be seen in the [release notes][release-notes].
+
+As usual, the IAM docker image can be obtained from [DockerHub][iam-login-service-docker].
+
+[release-notes]: https://github.com/indigo-iam/iam/releases/tag/v1.9.0
+[iam-login-service-docker]: https://hub.docker.com/r/indigoiam/iam-login-service/tags