Add wiki/strncpy.md

wiki/strncpy.md

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+# STRNCPY
+Strncpy is a function that takes two chars lists and a number as a parameter and write the second in the first but only the n - 1 first char (like strncpy in C)
+
+## params
+1. chars list
+2. chars list
+3. number
+
+## example
+```
+strncpy("y", "o", 2) "y" => "o"
+strncpy("y", "", 1) "y" => ""
+strncpy("", "o", 2) "" => "o"
+strncpy("hello ", "world!", 7) => "world!"
+strncpy("hello ", "world!", 14) => "world!"
+strncpy("hello ", "world!", 0) => "hello "
+```