cmdlinelogger.h: added basic documentation

Author: firewave

cli/cmdlinelogger.h

@@ -26,8 +26,11 @@ class CmdLineLogger
 public:
     virtual ~CmdLineLogger() = default;
 
+    /** print a regular message */
     virtual void printMessage(const std::string &message) = 0;
+    /** print an error message */
     virtual void printError(const std::string &message) = 0;
+    /** print to the output */
     virtual void printRaw(const std::string &message) = 0;
 };