logd: Add README.property

Change-Id: I89da10a73470b037f1811a9890d959cae186f257
diff --git a/logd/README.property b/logd/README.property
new file mode 100644
index 0000000..15a49db
--- /dev/null
+++ b/logd/README.property
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+The properties that logd responds to are:
+
+name                       type default  description
+logd.auditd.dmesg           bool  true   selinux audit messages duplicated and
+                                         sent on to dmesg log
+logd.dgram_qlen.statistics  bool  false  Record dgram_qlen statistics. This
+                                         represents a performance impact and
+                                         is used to determine the platform's
+                                         minimum domain socket network FIFO
+                                         size (see source for details) based
+                                         on typical load (logcat -S)