Created CharacterDeleter (markdown)

CharacterDeleter.md

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+# CharacterDeleter Class
+
+The `CharacterDeleter` class is responsible for deleting characters in the input string in the DynamicCursesInput gem. It provides a method to delete a character at the current cursor position.
+
+## Methods
+
+### .delete(input, cursor_pos)
+
+This is a class method that deletes the character at the current cursor position. It takes two parameters:
+
+- `input`: the current input string.
+- `cursor_pos`: the current cursor position.
+
+If the cursor is at the start of the line (i.e., `cursor_pos` is zero), it does not change the input string or the cursor position. Otherwise, it deletes the character at the cursor position and decreases the cursor position by 1.
+
+The method returns an array containing two elements: the updated input string and the updated cursor position.