1. Enlightning dyeing composition for keratinic fibres, particularly for human hair comprising in an appropriate medium for dye, at least one direct colorant, characterized in that it has a basic pH and contains as a direct dyeing agent a compound of general formula (1): [A - Z = N - B]<+> X<-> wherein Z is a nitrogen atom or radical -CH-; A and B are aromatic benzene or heterocyclic groups optionally substituted by one a plurality of halogen atoms or one or a plurality of radicals such as NR1R2 or OR1, in which R1 or R2, simultaneously or independent of each other represent hydrogen, alkyl radical having 1-8 carbon atoms, hydroxyalkyl radical having 1-4 carbon atoms or phenyl radical; X<-> is anion, preferably, chloride-anion or methylsulfate, wherein positive charge can be present in an aromatic cycle or it can be carried by one of its substituents. 2. Composition of Claim 1, characterized in that said dye is selected from compounds of formula (1), in which positive charge is present in the aromatic cycle A or B. 3. Composition of Claim 2, characterized in that said dye is selected from the following compounds:                   4. Composition of any Claim 1-3, characterized in that concentration of direct colorant ranges from 0.001 to 5% as per total mass of the composition. 5. Composition of Claim, characterized in that concentration of direct colorant ranges from 0.05 to 2% as per total mass of the composition. 6. Composition of any Claim 1-5, characterized in that contains alkalizing agent selected from ammonium hydroxide or alkanolamino. 7. Enlightning dyeing composition for keratinic fibres, particularly for human hair, ready to the use, characterized in that comprises in an appropriate medium for dye, at least, one direct colorant of general formula (1): [A - Z = N - B]<+> X<-> wherein Z is a nitrogen atom or radical -CH-; A and B are aromatic benzene or heterocyclic groups optionally substituted by one a plurality of halogen atoms or one or a plurality of radicals such as NR1R2 or OR1, in which R1 or R2, simultaneously or independent of each other represent hydrogen, alkyl radical having 1-8 carbon atoms, hydroxyalkyl radical having 1-4 carbon atoms or phenyl radical; X<-> is anion, preferably, chloride-anion or methylsulfate, wherein positive charge can be in aromatic cycle or it can be carried by one of its substituents and oxidizing agent and alkalizing agent in the amount sufficient to reach the final pH value, exceeding 7. 8. Composition of Claim 7, characterized in that the amount of alkalizing agent is sufficient to reach the final pH value between 8.5 and 11. 9. Method for the dyeing of keratinic fibres, particularly human hair, characterized in that comprises applying a composition on fibres to be dyed of any Claim 1-6, enlightning said fibres in basic medium using oxidizing agent, which is added just at the moment of employing to said composition for dyeing or which is present in the composition, simultaneously applied for enlightning. 10. A kit for enlightning dyeing if human hair, characterized in that comprises, at least, two compartments one for composition of any Claim 1-6, and the other for oxidizing agent in the appropriate medium for dye.