Create README.md

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README.md

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+[![Linux CI](https://github.com/flightaware/TclXML/actions/workflows/linux-ci.yml/badge.svg)](https://github.com/flightaware/TclXML/actions/workflows/linux-ci.yml)
+
+# TclXML
+TclXML is a package that provides XML parsing for the Tcl scripting language.
+It has two implementations of XML parsers: one written purely in Tcl
+and a wrapper for the Gnome libxml2 C library.
+
+The TclXML package now incorporates the TclDOM and TclXSLT packages.
+TclDOM and TclXSLT were previously distributed as separate packages.
+The three packages may still be used as if they were standalone.