Update Readme.md

Readme.md

@@ -21,6 +21,18 @@ This document will guide you to build the application on a Linux machine with An
 git clone --recursive https://github.com/meganz/android.git
 ```
 
-* Configure the variable `NDK_ROOT` to point to your Android NDK installation path at `jni/build.sh`.
+* Configure the variable `NDK_ROOT` to point to your Android NDK installation path at `app/src/main/jni/build.sh`.
 
-* Open the project with Android Studio, let it build the project and hit _*Run*_
+* Go to `app/src/main/jni/` and execute: `./build.sh clean` and `./build.sh all`.
+
+* Download the link https://mega.nz/#!1tcl3CrL!i23zkmx7ibnYy34HQdsOOFAPOqQuTo1-2iZ5qFlU7-k, uncompress it and put the folders `debug` and `release` in the path `app/src/`.
+
+* Open the project with Android Studio, let it build the project and hit _*Run*_.
+
+### Notice
+
+To use the *geolocation feature* you need a *Google Maps API key*:
+
+* To get one, follow the directions here: https://developers.google.com/maps/documentation/android/signup.
+
+* Once you have your key, replace the "google_maps_key" string in these files: `app/src/debug/res/values/google_maps_api.xml` and `app/src/release/res/values/google_maps_api.xml`