[FEATURE] Write simC code for question 105

[Siddhartha Dhar Choudhury]

Question

Write a program to calculate the sum of first 25 natural numbers.

Where to put the code?

In simc-codes directory

What to name the file?

q105.simc

Note: You can only start doing a question if it has been assigned to you by a maintainer. Once assigned to someone this questions will not be reassigned, it can only be reassigned if the person does not complete his/her task."

[aashishat718]

@frankhart2018 I would like to work on this code

[Mathias Fernandes Duarte Coelho]

Assigned to you @aashishat718 .