Create build_notes_android.md

docs/build_notes_android.md

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+Pre-requesties
+--------------
+
+You need to install Android SDK, NDK  and QT with android support.
+
+SDK (choose command line tools only)  
+https://developer.android.com/studio/index.html  
+NDK 
+https://developer.android.com/ndk/downloads/index.html
+
+QT
+https://www.qt.io/download-open-source/
+Choose one for your platform for android
+For example QT 5.6 under Linux would be
+http://download.qt.io/official_releases/qt/5.6/5.6.1-1/qt-opensource-linux-x64-android-5.6.1-1.run  
+
+You also need Java JDK and Ant.
+
+QT-Creator
+----------
+Open QT-creator that should be installed with QT.  
+Go to Settings/Anndroid and specify correct paths to SDK and NDK.
+If everything is correct you will see two set avaiable:  
+Android for armeabi-v7a (gcc, qt) and Android for x86 (gcc, qt).
+
+Dependencies
+--------------
+Take following pre-compiled binaries from PurpleI2P's repositories.  
+git clone https://github.com/PurpleI2P/Boost-for-Android-Prebuilt.git
+git clone https://github.com/PurpleI2P/OpenSSL-for-Android-Prebuilt.git
+git clone https://github.com/PurpleI2P/MiniUPnP-for-Android-Prebuilt.git
+git clone https://github.com/PurpleI2P/android-ifaddrs.git
+
+
+Building the app
+----------------
+Open qt/i2pd_qt/i2pd_qt.pro in the QT-creator.
+Change line MAIN_PATH = /path/to/libraries to actual path where did you put the dependancies to.
+Select appropriate project (usually armeabi-v7a) and build.
+You will find an .apk file in android-build/bin folder.  
+
+