libtock: services: readme

libtock/services/README.md

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+Libtock Services
+================
+
+This directory holds higher-level services that build on top of the raw syscalls
+defined in other folders in the `libtock` directory.
+
+Unlike the other libtock interfaces, services defined in this folder can have
+internal state, though any functionality that requires calls to `yield()`
+still belongs in `libtock-sync`.