Added overview section to README.md

README.md

@@ -36,10 +36,35 @@ $ ./install.sh $BIN_DIR $LIB_DIR
 
 An installation directory will be created if it doesn't already exist.
 
+## Overview
+
+Bash script ``http_xsltproc.sh`` is a wrapper around the ``xsltproc`` command-line tool. Unlike ``xsltproc``, this script fetches the target XML document from an HTTP server. See the inline help file for details:
+
+```Shell
+$ http_xsltproc.sh -h
+```
+
+Here's an example:
+
+```Shell
+$ MD_LOCATION=http://md.incommon.org/InCommon/InCommon-metadata.xml
+$ $BIN_DIR/http_xsltproc.sh $LIB_DIR/list_all_IdP_DisplayNames_csv.xsl $MD_LOCATION | head
+IdP Display Name,IdP Entity ID,IdP Discovery,Registrar ID
+"Ohio State University",urn:mace:incommon:osu.edu,show,https://incommon.org
+"Cornell University",https://shibidp.cit.cornell.edu/idp/shibboleth,show,https://incommon.org
+"University of California - Office of the President",urn:mace:incommon:ucop.edu,show,https://incommon.org
+"University of California-Irvine",urn:mace:incommon:uci.edu,show,https://incommon.org
+"University of Washington",urn:mace:incommon:washington.edu,show,https://incommon.org
+"Internet2",urn:mace:incommon:internet2.edu,show,https://incommon.org
+"University of California-San Diego",urn:mace:incommon:ucsd.edu,show,https://incommon.org
+"Georgetown University",https://shibb-idp.georgetown.edu/idp/shibboleth,show,https://incommon.org
+"Case Western Reserve University",urn:mace:incommon:case.edu,show,https://incommon.org
+```
+
 ## Compatibility
 
-These scripts are compatible with GNU/Linux and Mac OS.
+The executable scripts are compatible with GNU/Linux and Mac OS. The library files are written XSLT 1.0.
 
 ## Dependencies
 
-None
+* [Bash Library](https://github.internet2.edu/InCommon/bash-library)