Amnesia ECHO V1 addon

Here is a WIP of Amnesia ECHO, it's not fully complete, so please be patient. Installation instructions: 1. Extract all sound files to C:/ Program Files/ Amnesia - The Dark Descent > redist > sounds 2. Ensure that your sound is on and turned up in volume. 3. Done, please do note some of the echo is pretty subtle, but it's there. Your speakers/headset will pick up the echoing sound better in surround sound audio. Thanks. Enjoy.