Adding tests and moving code around

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "tests/roms/nes-test-roms"]
+	path = tests/nes-test-roms
+	url = git@github.com:christopherpow/nes-test-roms.git

README.md

@@ -17,7 +17,9 @@ Credits
 - The code was later improved and maintained by Christopher Snowhill (a.k.a. [kode54](https://kode54.net/))
 - I could trace further contributions (e.g., new mappers) by retrowertz, CaH4e3, some adaptations from the [FCEUX emulator](https://github.com/TASEmulators/fceux) (see mapper021)
 - The latest version of the code is maintained by Libretro's community [here](https://github.com/libretro/QuickNES_Core)
-- For the interactive player, this project uses a modified version of [HeadlessQuickNES (HQN)](https://github.com/Bindernews/HeadlessQuickNes).  
+- For the interactive player, this project uses a modified version of [HeadlessQuickNES (HQN)](https://github.com/Bindernews/HeadlessQuickNes) by Drew (Binder News)
+- We use some of the [NES test rom set](https://github.com/christopherpow/nes-test-roms) made by multiple authors and gathered by Christopher Pow et al.
+- We also use some movies from the (TASVideos)[tasvideos.org] website for testing. These movies are copied into this repository with authorization under the Creative Commons Attribution 2.0 license.
 
 All base code for this project was found under open source licenses, which I preserved in their corresponding files/folders. Any non-credited work is unintentional and shall be immediately rectfied.