add fetch.md

fetch.md

@@ -0,0 +1,14 @@
+```
+$adb = "C:\Users\david\AppData\Local\Android\Sdk\platform-tools\adb.exe"
+1..9 | ForEach-Object {
+    $n = "{0:D3}" -f $_
+    $name = "Rhythmology_$n.json"
+    $args = @(
+        "exec-out", "run-as", "at.lockstep.player", "cat",
+        "files/beat_annotations/$name"
+    )
+    Start-Process -FilePath $adb -ArgumentList $args `
+        -NoNewWindow -Wait -RedirectStandardOutput $name
+}
+```
+