minimal doc added

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+Environment variables:
+
+OVERHOSTS_ALIASES - pipe separated list of aliased hosts
+OVERHOSTS_REAL - the target of host aliases
+
+Usage:
+
+$ export OVERHOSTS_ALIASES="alias1|alias2|alias3"
+$ export OVERHOSTS_REAL="targethost"
+$ LD_PRELOAD=overhosts.so <progname>
+