Hollow diamond alphabets pattern

[Manojkumar2806]

Feature description

Add the hollow_diamond_alphabet function, which prints a hollow diamond pattern using uppercase alphabet characters based on the specified size. The parameter n determines the number of rows in the diamond. This function uses spaces for alignment and hollow spaces within the diamond structure, creating a visually appealing output.

Please assigned to me. I want to add this pattern in this repo and also please give the tags gccos and hactoberfest