Add basic README markdown file

README.md

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+F-Droid Client
+==============
+
+Client for [F-Droid](https://fdroid.org), the Free Software repository system
+for Android.
+
+
+Building from source
+--------------------
+
+The only required tools are the Android SDK and Apache Ant.
+
+$ android update project -p .
+$ ant clean release
+
+
+Direct download
+---------------
+
+You can download the application directly from our site:
+[FDroid.apk](https://f-droid.org/FDroid.apk)
+
+
+Contributing
+------------
+
+You are welcome to submit Merge Requests via the Gitorious web interface. You
+can also follow our [Issue tracker](https://f-droid.org/repository/issues/)
+and our [Forums](https://f-droid.org/forums/).
+
+
+License
+-------
+
+This program is Free Software: You can use, study share and improve it at your
+will. Specifically you can redistribute and/or modify it under the terms of the
+[GNU General Public License](https://www.gnu.org/licenses/gpl.html) as
+published by the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.