Comments (%)
CachéQuality release 
        CachéQuality 1.0.0
      Domain 
        Documentation
      Scope 
        Project
          File
          Class
      Density of comment lines, with such a formula:
- 50% means that the number of lines of code equals the number of comment lines
 - 100% means that the file only contains comment lines
 
Method of calculation
Density of comment lines = Comment lines / (Lines of code + Comment lines) * 100

