Add some javadoc files

core/java/src/net/i2p/data/i2cp/package.html

core/java/src/net/i2p/data/package.html

core/java/src/net/i2p/stat/package.html

core/java/src/net/i2p/util/package.html

router/java/src/net/i2p/data/i2np/package.html

router/java/src/net/i2p/router/transport/tcp/package.html