Update README

Author: nwellnhof

README

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+# libxslt
+
+libxslt is an XSLT processor based on libxml2.
+
+Official releases can be downloaded from
+<https://download.gnome.org/sources/libxslt/>
+
+The git repository is hosted on GNOME's GitLab server:
+<https://gitlab.gnome.org/GNOME/libxslt>
+
+Bugs should be reported at
+<https://gitlab.gnome.org/GNOME/libxslt/-/issues>
+
+Documentation is available at
+<https://gitlab.gnome.org/GNOME/libxslt/-/wikis>
+
+The build system is similar to libxml2. Refer to libxml2's README for
+build instructions.
+