Update README.md

README.md

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 ```
 libnds audio player modeled after fauux's lain fansite
 
+# this repo does not include the libnds source!
+## the entire devkitPro nds-dev ecosystem should be installed, but this program specifically uses maxmod and various nds.h headers
+if you /really/ want to compile entirely from source, libnds is located [here](https://github.com/devkitPro/libnds). it shouldn't be hard to adapt it yourself.
+
 Let's All Love Lain!