Update README.md

README.md

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 # android-download-tool
 (APACHE-2) script to download android SDK and NDK
+
+This repository is designed to download the Android SDK and NDK on Travis linux interface. it download the last android SDK and request all basic packages
+
+in your .travis.yml
+
+    env: TAG=Android
+    install:
+      # download NDK
+      - if [ "$TAG" == "Android" ]; then
+            cd ..;
+            git clone --depth=1 https://github.com/HeeroYui/android-download-tool;
+            ./android-download-tool/dl-android.sh;
+            export ANDROID_NDK_ROOT=`pwd`/android/ndk"
+            export ANDROID_SDK_ROOT=`pwd`/android/sdk"
+            cd -;
+        fi
+
+This will download the last NDK and SDK in the folder: ../andoid/ndk and ../android/sdk
+
+Note: It does not support other platform than Linux. (for now... ask us to have it on MacOs...)
+
+