baseline: OpenMU upstream b5a0961 (fresh source)

src/Interfaces/Readme.md

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+# Interfaces
+
+This project contains the interfaces which are used to communicate between the
+different sub-systems ("servers") of the whole system.
+
+The game logic and game server should only use these interfaces instead of the
+actual implementations.
+The goal is to make them exchangeable. This can be helpful for tests, and also
+if we want to move specific systems to other machines or external processes
+(scale-out).
+Then there could be an implementation of an interface which forwards the calls
+over the network (etc.) to another process.