Simply drop all files in:
Terminator Resistance\Terminator\Binaries\Win64
Press caps lock to toggle HUD on/off.
Be aware that menus, button prompts and dialogue options will also disappear when HUD is toggled off.
Changing keybinds:
To change bindings simply open d3dx.ini, search for ;Keybinds to find this section:
[Key1]
Key = caps
x = 0
type = toggle
Then simply change Key = caps to someting else.
Reshade compatibility:
Make sure your Reshade file is called dxgi.dll and not d3d11.dll.
This should happen automatically if you install HUD toggle mod first. Just make sure reshade is installed to the same directory as the mod.
I can't guarantee this will work for every system and configuration out there, I have only tested it on my own (Windows 10 with latest update and Nvidia GPU)