chore(MADEWITHVRTK.md): add games to list
chore(MADEWITHVRTK.md): add games to list

Add Captain 13 Beyond the Hero and Yanone - Letter Splatter
gomez-addams/SteamVR_Unity_Toolkit,thestonefox/SteamVR_Unity_Toolkit,gpvigano/VRTK,mattboy64/SteamVR_Unity_Toolkit,Innoactive/IA-unity-VR-toolkit-VRTK,thestonefox/VRTK,adamjweaver/VRTK,TMaloteaux/SteamVR_Unity_Toolkit,Fulby/VRTK,gpvigano/SteamVR_Unity_Toolkit