Update README.md

implementations/README.md

@@ -1,6 +1,16 @@
 # WoT Discovery
-The following are meant to be implementations of the current spec and will be used for validation.
+## Implementations
+The following are meant to be implementations of directories in the current spec and will be used for validation of the directory service specification.
 
 * [linksmart_tdd.md Fraunhofer - LinkSmart]: Detail TBD.  JSON Path and XPath.
 * [upmoeg_tdd.md UPM - OEG]: Detail TDB.  JSON Path, XPath, and SPARQL.
 * [siemens_tdd.md Siemens]: Detail TDB.  JSON Path, SPARQL.
+
+A detailed table of supported features for each implementation will be listed in Implementation Report.  Link TBD.
+An implementation may support features not in the standard, but these will not be covered in the 
+Implementation Report; please see the documentation of individual implementations for additional features.
+
+In addition, the following introduction mechanisms have been implemented and tested:
+* Direct URL
+* [link DNS-SD/mDNS]: Hitachi
+* Others TBD...