Adding explicit guideline for contributors into GUIDELINES file

GUIDELINES

@@ -0,0 +1,10 @@
+1. Use the Eiffel Style guidelines
+	- http://dev.eiffel.com/Style_Guidelines
+	- (advisable) http://dev.eiffel.com/Local_Declaration_Guidelines
+
+2. Use the Eiffel Information System to link specification (Rosetta Code page) and the Eiffel implementation.
+See: http://docs.eiffel.com/book/eiffelstudio/eiffel-information-system
+
+3. Ensure that the ECF file is not confused after a sub-cluster addition.
+
+Thanks for your future contribution.

README

@@ -1,11 +1 @@
-Description:
-	Examples in Eiffel based on problem descriptions from Rosetta Code (http://rosettacode.org/wiki/Rosetta_Code)
-
-Advices:
-	1. Make it easy to read for Eiffel newcomers.
-
-	2. Use the Eiffel Style guidelines
-		- http://dev.eiffel.com/Style_Guidelines
-		- (advisable) http://dev.eiffel.com/Local_Declaration_Guidelines
-
-	3. Ensure that the ECF file is not confused after a sub-cluster addition.
+Examples in Eiffel based on problem descriptions from Rosetta Code (http://rosettacode.org/wiki/Rosetta_Code)