Merge branch 'ranking' of gitlab.c3sl.ufpr.br:portalmec/portalmec into ranking

lib/ranking/README.md

 # Use Example
-
+### Input :
     items = [Item.new("ax",1,1,1,["otherStuffA","lala",'a']),Item.new("bx",2,2,2,[1,2,3,"teste","lblb",'b']),Item.new("cx",1,1,99,[3,2,1,"teste","lclc",'c'])]
 
+### Rank call :
+
     Rater.new.sortByRate(items).each { |i| puts i }
-OR
+    
+###### OR
+
     Rater.new( # Order of the arguments is important!
         positionWeight = 1000,
         useWeight = 1, 
         likeWeight = 100
     ).sortByRate(items).each { |i| puts i }
+    
+    
+#### Return (output) : 
+ - ordered array of Items, starting from the most ranked to the least
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