[#1829][android] Refined Vagrant README

* Added hardware and download volume to requirements
* Refined HOWTO

android/Vagrant.README.md

@@ -4,8 +4,13 @@ Provide a turn-key VM for Android development
 
 ## Requirements
 
-* Vagrant
-* VirtualBox
+* [Vagrant](https://www.vagrantup.com/downloads.html)
+* [VirtualBox](https://www.virtualbox.org/wiki/Downloads)
+* Host:
+  * 4 CPU cores (2 used by VM)
+  * ~18 GB disk space
+  * 4 GB RAM (2 used by VM)
+* Download volume (once): ~3.5 GB
 
 ## HOWTO
 
@@ -13,16 +18,19 @@ Provide a turn-key VM for Android development
    1. `cd <BOINC_REPO>/android`
    1. `vagrant up`
    1. Wait until the final reboot finished
-   1. `vagrant ssh`
-   1. `cd BOINC/android`
-   1. `./build_all.sh`
+   1. **From this point on you don't need Vagrant anymore**
+      1. Don't run `vagrant up` again!
+      2. Just use VirtualBox to stop/start your new shiny VM
 1. In the VM:
    1. Log in with `vagrant/vagrant`
+   1. Open a terminal
+      1. `cd BOINC/android`
+      1. `./build_all.sh`
    1. Start Android Studio
    1. No need to change anything in the setup assitant (just complete it)
       * OK / Next / Next / Finish / Finish
    1. Import the BOINC App as *Gradle* project from: `~/BOINC/android/BOINC`
-   1. Ignore potential Gradle Plugin warning: Don't remind me again
+   1. Ignore potential Gradle Plugin warning: *Don't remind me again*
 1. Hook up your Android device via USB (and remember to attach it to VirtualBox)
 1. Happy hacking :-)