Update microdroid demo instruction
The -t flag is needed to install a test apk. And added a warning to
ensure that the permission has to be granted before running the app.
Bug: N/A
Test: N/A
Change-Id: I262d80a400bb80e39bb59cd99e260adcc7784647
diff --git a/demo/README.md b/demo/README.md
index 37198ad..43d2ebc 100644
--- a/demo/README.md
+++ b/demo/README.md
@@ -9,10 +9,13 @@
## Installing
```
-adb install out/dist/MicrodroidDemoApp.apk
+adb install -t out/dist/MicrodroidDemoApp.apk
adb shell pm grant com.android.microdroid.demo android.permission.MANAGE_VIRTUAL_MACHINE
```
+Don't run the app before granting the permission. Or you will have to uninstall
+the app, and then re-install it.
+
## Running
Run the app by touching the icon on the launcher. Press the `run` button to