Update README

README.md

@@ -1,3 +1,17 @@
 # QGIS Server Administration
 
-See QGIS Server Administration tool's [documentation](https://pblottiere.github.io/QSA/).
+Components:
+
+* [QSA REST API](https://pblottiere.github.io/QSA/qsa-api/): Flask web server with a REST API for administrating QGIS Server
+* [QSA plugin](https://pblottiere.github.io/QSA/qsa-plugin/): QGIS Server plugin for introspection
+* [QSA cli](https://pblottiere.github.io/QSA/qsa-cli/): Command line tool
+
+Main features:
+* Create and manage QGIS projects stored on filesystem
+* Create and update vector layers : symbology, theme, ...
+* Inspect online QGIS Server instances
+* Cache management with MapProxy
+
+
+See QGIS Server Administration tool's
+[documentation](https://pblottiere.github.io/QSA/) for more details.