docs: add Decision-Record about removing SFTP

docs/development/decision-records/2024-04-11_remove_sftp/README.md

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+# Remove SFTP modules
+
+## Decision
+
+Starting with the next release of Tractus-X EDC, the SFTP modules will be removed from the code base. Specifically `transferprocess-sftp-client`, `transferprocess-sftp-common` and `transferprocess-sftp-provisioner`.
+
+## Rationale
+
+These modules don't implement any official Catena-X Standard, and as such, have not been part of any official Tractus-X EDC distribution for a significant period of time. 
+Further, those modules are not up to the coding standards established by Tractus-X EDC, and would have to be refactored significantly. Even then, having dead code in a repository is bad hygiene, as it generates maintenance churn. Tractus-X EDC is not responsible for maintaining niche extensions, that are not officially sanctioned.
+
+## Approach
+
+Starting with version `0.8.x` of Tractus-X EDC, these modules will be deleted from the code base. At that time, stakeholders interested in continuing to maintain them are welcome to adopt them into their own repositories.