Add a README with build instructions

README.md

Index: README.md
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+Adblock Plus for Android
+========================
+
+An Android app that runs a proxy to block ads.
+
+Buildling with Ant
+------------------
+
+### Requirements
+
+- [The Android SDK](http://developer.android.com/sdk)
+- [The Android NDK](https://developer.android.com/tools/sdk/ndk)
+- [Ant](http://ant.apache.org)
+
+### Building
+
+In the project directory, create the file _local.properties_ and set
+_sdk.dir_ and _ndk.dir_ to where you installed it, e.g.:
+
+    sdk.dir = /some/where/sdk
+    ndk.dir = /some/where/ndk
+
+Then run:
+
+    ant debug
+
+### Running
+
+Connect an Android device or start the Android Emulator, then run:
+
+    ant debug install
+
+Finally, you can run _Adblock Plus_ from the launcher.
+
+Building with Eclipse
+---------------------
+
+### Requirements
+
+- [The Android SDK](http://developer.android.com/sdk)
+- [The Android NDK](https://developer.android.com/tools/sdk/ndk)
+- [Eclipse](https://www.eclipse.org)
+- [Android Developer Tools for Eclipse](http://developer.android.com/tools/sdk/eclipse-adt.html)
+  (both _Developer Tools_ and _NDK Plugins_)
+- [C++ Developer Tools for Eclipse](http://projects.eclipse.org/projects/tools.cdt)
+
+### Building
+
+1. Select _Import_ in the _File_ menu, then _Existing Android Projects Into Workspace_.
+2. Select the project directory (_adblockplusandroid_) as _Root Directory_.
+3. Select the projects _Adblock Plus_, _library_ and _android-switch-backport_.
+4. Revert any local changes to _.classpath_ in _adblockplusandroid_
+   and _adblockplusandroid/submodules/android-switch-backport_.
+
+### Running
+
+1. Connect an Android device or start the Android Emulator.
+2. In Eclipse, select the _Adblock Plus_ project, then run it as an
+   _Android Application_.