docs: add data_root to m64plus-fz

emulators/m64plus-fz.yml

@@ -19,6 +19,12 @@ systems:
   - nintendo-64dd
 mode: standalone
 
+data_root:
+  android:
+    path: "/data/data/org.mupen64plusae.v3.fzurita/files"
+    source_ref: "app/src/main/java/paulscode/android/mupen64plusae/persistent/AppData.java:409-411"
+    note: "Private storage of the package, under its own id for the .pro and .amazon builds. The 64DD IPL and Transfer Pak files are picked in the settings and copied in."
+
 notes: |
   Android fork of Mupen64Plus AE, whose paulscode.android.mupen64plusae
   namespace it keeps, published under three package ids built from one code