Update DFS readme

[oanarosca]

This is a(n):

• [ ] New algorithm
• [x] Update to an existing algorithm
• [ ] Error
• [ ] Proposal to the Repository

Details:

Add a description of the DFS algorithm and a relevant example, as well as links for further reading.

[tiagokapp]

include

main(){

int n;
printf("digite uma opcao");
scanf("%d",&n);

switch (n){

case 1:
    printf("novo algoritmo");
     break;
case 2: 
printf("atualizar um algoritmo existente");
break;

case 3:

printf("erro");
break;  

case 4 : printf(" Proposta ao Repositório");

break;

} printf ("\n\n\nobrigado");

}

[arnavb]

@tiagokapp :rofl: