Update ADOPTERS.md (cloudnative-pg#2864)

Added Optimadata to the list of adopters

Signed-off-by: ThomasSpoelstra <97104300+ThomasSpoelstra@users.noreply.github.com>

Author: ThomasSpoelstra

ADOPTERS.md

@@ -33,3 +33,4 @@ This list is sorted in chronological order, based on the submission date.
 | [Tembo](https://tembo.io/) | @tembo-io | 2023-07-17 | Tembo is the developer platform for PostgreSQL extensions. Build and share extensions with [Trunk](https://pgt.dev), and use any extension on Tembo Cloud. |
 | [CNDI](https://cndi.dev) | @johnstonmatt | 2023-08-21 | Provides simple workflow to deploy self-hosted CloudNativePG clusters with GitOps and Infrastructure as Code. |
 |[PITS Global Data Recovery Services](https://www.pitsdatarecovery.net/)| @benjx1990 | 2023-09-07 | CloudNativePG is  used to easily manage highly-loaded database clusters |
+| [OptimaData] (https://www.optimadata.nl) | @edco-wallet | 2023-09-25 | OptimaData as the Dutch database expert company has done several projects running CloudNativePG for managing Postgres clusters. Read our [how to run Postgres on Kubernetes blogpost](https://www.optimadata.nl/blogs/3/k9pv6z-how-to-postgres-on-kubernetes%2C-part-2) to learn more and how easy you can deploy with CloudNativePG. |