Add title screen section to Part II (#137)

* Adds title screen section to tutorial

* Make title screen code buildable

* Change to Memcopy usage

* Added title screen text and assets

---------

Co-authored-by: Devon Wilkerson <wilkersonrdevon@gmail.com>
Co-authored-by: Antonio Vivace <avivace4@gmail.com>

Author: 3 people

src/SUMMARY.md

@@ -29,6 +29,7 @@
 - [Input](part2/input.md)
 - [Collision](part2/collision.md)
 - [Bricks](part2/bricks.md)
+- [Title Screen](part2/title-screen.md)
 - [Decimal Numbers](part2/bcd.md)
 - [Work in progress](part2/wip.md)
 

src/assets/part2/img/title-screen.png

@@ -0,0 +1,14 @@
+# Title Screen
+
+Let's make our game more official and give it a title screen! First, copy the tileset and tilemap found [here](https://github.com/gbdev/gb-asm-tutorial/raw/master/unbricked/title-screen/tilemap-titlescreen.asm) and paste it at the end of your code. This will make a title screen that looks like so: 
+
+![Title Screen](../assets/part2/img/title-screen.png)
+
+Then copy and paste the following after waiting for VBlank:
+
+```rgbasm,linenos,start={{#line_no_of "" ../../unbricked/title-screen/main.asm:title_screen}}
+{{#include ../../unbricked/title-screen/main.asm:title_screen}}
+```
+Note that we are using our `Memcopy` function from the [Functions](./functions.md) lesson! Isn't it handy to have reusable code? We are also using our `UpdateKeys` function from the [Input](./input.md) lesson to determine when to stop displaying the title screen and move on to the game itself. To do so, we loop until the start button has been pressed. 
+
+And just like that we have ourselves a title screen! 

src/part2/title-screen.md

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+rgbasm -o main.o main.asm
+rgbasm -o input.o input.asm
+rgblink -o unbricked.gb main.o input.o
+rgbfix -v -p 0xFF unbricked.gb