Add README, AUTHORS and ChangeLog.

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+Andrew Tridgell <tridge@samba.org>
+Andreas Schneider <asn@samba.org>

diff --git a/ChangeLog b/ChangeLog
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diff --git a/README b/README
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+UID wrapper library
+====================
+
+This library intercepts seteuid and related calls, and simulates them
+in a manner similar to the nss_wrapper and socket_wrapper libraries.
+
+This allows you to do user switching when testing e.g. file servers.
+
+To use it set the following environment variables:
+
+LD_PRELOAD=libuid_wrapper.so
+UID_WRAPPER=1