add example in the README

Author: misev

README.md

@@ -13,7 +13,21 @@ given WCS endpoint.
 
 # Examples
 
+```python
+from wcs.service import WebCoverageService
 
+wcs_endpoint = "https://ows.rasdaman.org/rasdaman/ows"
+service = WebCoverageService(wcs_endpoint)
+
+# get a list of all coverages, with basic information such
+# as a WGS 84 bounding box and a native bounding box
+coverages = service.list_coverages()
+avg_land_temp = coverages['AvgLandTemp']
+
+# get full information for a particular coverage by
+# parsing its DescribeCoverage document from the WCS server
+full_avg_land_temp = service.list_full_info('AvgLandTemp')
+```
 
 # Contributing