Re-write Introduction to reference REST API in general

Author: jhendersonHDF

Introduction/index.rst

@@ -2,11 +2,16 @@
 Introduction
 ###################
 
-HDF Kita is a web service that can be used to send and receive HDF5 data.   
-HDF Kita uses a REST interface to support CRUD (create, read, update, delete) operations on 
-the full spectrum of HDF5 objects including: groups, links, datasets, attributes, and 
-committed data types.   As HDF Kita is a REST-based service, a variety of clients can be developed in 
-JavaScript, Python, C, and other common languages.
+The HDF REST API is an interface to HDF5 data stored on network-based architectures.
+The HDF REST API has provisions to support CRUD (create, read, update and delete) operations on
+the full spectrum of HDF5 objects including: groups, links, datasets, attributes, and committed
+data types. See https://support.hdfgroup.org/pubs/papers/RESTful_HDF5.pdf for more information on the
+RESTful HDF5 interface.
 
- 
+As a REST-based API, implementations can be developed in a variety of languages, such as
+JavaScript, Python, C, and other common languages. Some services which implement the HDF REST API are:
 
+HDF Kita: https://www.hdfgroup.org/hdf-kita
+
+H5serv: https://github.com/HDFGroup/h5serv 
+