Added a slew of package.html javadocs.
diff --git a/net/api/src/main/javadoc/org/onlab/onos/event/package.html b/net/api/src/main/javadoc/org/onlab/onos/event/package.html
new file mode 100644
index 0000000..1591f3d
--- /dev/null
+++ b/net/api/src/main/javadoc/org/onlab/onos/event/package.html
@@ -0,0 +1,3 @@
+<body>
+Local event delivery subsystem interfaces &amp; supporting abstractions.
+</body>
\ No newline at end of file