Created CharacterAdder (markdown)

CharacterAdder.md

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+# CharacterAdder Class
+
+The `CharacterAdder` class is responsible for adding characters to the input string in the DynamicCursesInput gem. It provides a method to add a character at the current cursor position.
+
+## Methods
+
+### .add(chk, input, cursor_pos)
+
+This is a class method that adds a character at the current cursor position. It takes three parameters:
+
+- `chk`: the character to be added.
+- `input`: the current input string.
+- `cursor_pos`: the current cursor position.
+
+The method inserts the character at the cursor position and increases the cursor position by 1. This simulates the effect of typing a character at the cursor's position in a text editor.
+
+The method returns an array containing two elements: the updated input string and the updated cursor position.