Added example code

src/example/char_out.md

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+# ```char_out```
+
+> Version: 1.0.20092.1 \
+> Created by: Jali <jali@orca-central.de> \
+> Last modified by: Jali <jali@orca-central.de>
+
+## About
+
+The ```char_out``` function is one of the built-in functions from the ROM.
+It takes a character, and writes it onto the screen, at a specific location.
+
+## Parameters
+
+```char_out``` is called through address 0x8468. It takes three parameters:
+- Register A holds the ASCII code of the character to print
+- Register DE holds the position on the screen. D is a value between 0 and 3, representing
+  the row, while E has a value between 0-23, representing the column to print in.
+
+## Example
+
+```ASM
+10;Outputs an "A" in the second column of the last row
+20          ORG     100H    ;Tell the assembler to start at addr. 0x100
+30START:    LD      A,41H   ;Load the letter "A" to register A
+40          LD      DE,301H ;Sets the row to 3 and the column to 1
+50          CALL    8468H  ;Calls the ```char_out``` function
+60          RET             ;Return
+70          END             ;Marks the end of the code for the assembler
+```