posix: add REAME.md

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/posix/README.md b/lib/posix/README.md
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+Services conforming to POSIX
+
+The core module `posix` includes POSIX services available on all POSIX compliant systems.
+For services provided by some implementations of POSIX but absent from any POSIX version,
+import `posix::ext`.