Create documentation for SIUBEN Adaptor (#754)

Added documentation for the SIUBEN Adaptor, detailing its purpose and contribution guidelines.

Author: aleksa-krolls

adaptors/siuben-rd.md

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+---
+title: SIUBEN Adaptor
+---
+
+## About `SIUBEN-RD` / Sobre `SIUBEN-RD`
+ES: Este es un adaptador prototipado para el gobierno de la República Dominicana para conectarse con el Sistema Único de Beneficiarios (SIUBEN) y automatizar los flujos de trabajo relacionados con los servicios sociales.
+
+EN: This is an adaptor prototyped for the Dominican Republic government to connect with the Single System of Beneficiaries (Sistema Único de Beneficiarios - SIUBEN) to automate related social services workflows.
+
+### I've noticed a problem with this Adaptor, or something is out of date, what can I do?
+
+Thanks for asking! We are a fully Open Source Digital Public Good, and we welcome contributions from our community. Check out our [Adaptors Wiki](https://github.com/OpenFn/adaptors/blob/main/wiki/index.md) for more information on how you can update Adaptors!
+
+Or, you can always reach out to the Community through our [Community Forum here](https://community.openfn.org/).