Added simple HTTP client.

For now the implementation is using Eiffel cURL library.
It requires Eiffel cURL coming with next EiffelStudio 7.0 (or from eiffelstudio's repo from rev#87244 )

library/client/http_client/src/http_client.e

@@ -0,0 +1,16 @@
+note
+	description : "Objects that ..."
+	author      : "$Author$"
+	date        : "$Date$"
+	revision    : "$Revision$"
+
+deferred class
+	HTTP_CLIENT
+
+feature -- Status
+
+	new_session (a_base_url: READABLE_STRING_8): HTTP_CLIENT_SESSION
+		deferred
+		end
+
+end