add explanation

README.md

@@ -2,6 +2,12 @@
 
 A Latin fansub of Serial Experiments Lain
 
+## Why?
+
+I want to watch entertaining content in Latin as a fun, passive way to study. And since I already watch anime in Japanese with English subtitles, why not? It's already something I'm experiencing as a translation, so why not as a translation into a language I'm studying?
+
+And since others may want the same thing, it seemed natural that I open this project to anyone who wants to help.
+
 
 ## Volunteer