update README

README.md

@@ -5,20 +5,18 @@
 [![CRAN_Status_Badge](http://www.r-pkg.org/badges/version/geometa)](https://cran.r-project.org/package=geometa)
 [![Github_Status_Badge](https://img.shields.io/badge/Github-0.1--0-blue.svg)](https://github.com/eblondel/geometa)
 
-R tools to write and read OGC/ISO geographic metadata (19115:2003, 19139)
+**Tools for Reading and Writing ISO/OGC Geographic Metadata**
 
-Ongoing work
+``geometa`` provides facilities to manipulate geographic metadata defined with OGC/ISO 19115 and 19139 (XML) standards, including an API to create in R representations of geographic metadata, as defined in the above standards, and write it to XML, or even to read an XML metadata into R.
 
-Current Focus:
+Please check the [online documentation](https://github.com/eblondel/geometa/wiki) for more details!
 
+Current Focus:
 * ISO 19115:2003 standard
 * ISO 19139 XML with **Encoding** and **Decoding** support
 * Classes for describing **vector data**
 
-Next:
-* 1st release in CRAN
-
-Nice to have:
-* Add classes for ISO 19110 / Feature Catalogue
-* Add classes specific to raster/coverage data description
+Not yet supported:
+* classes for ISO 19110 / Feature Catalogue
+* classes specific to raster/coverage data description