Update README.md

README.md

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 # mzpp19
 High performance palindromic prime number generator
+
+It finds and prints all palindrome prime between 0 and 2^64-1
+The output is in according b-files format (https://oeis.org/)
+.
+In order to generate the prime numbers it uses an efficient implementation of the Sieve of Eratosthenes
+
+**About palindrome prime numbers**
+All palindromic prime numbers have odd lengths, except the prime number 11.
+Since 2^64 == 18446744073709551616 which is 20 digits long, we have that 64-bit palindromic prime numbers are at most 19 digits long.