Update README.md

Author: creeperita09

README.md

@@ -4,3 +4,7 @@ idk random thingy i made in godot
 
 this is my first and very messy godot project
 if you want to contribute to my spaghetti code you're welcome
+
+# NOTE
+the brainpower video is too big to upload on github, you must get it from youtube if you wanna build from source (file is included in build)
+use https://cobalt.tools/ to download the video (720p h264/h265), then convert it to webm (ffmpeg reccomended) then place it into /assets/brainpower.webm