Add README

README.md

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+wp2git
+======
+
+This program allows you to download and convert any Wikipedia article's history to a git repository, for easy browsing and blaming.
+
+### Usage
+
+    $ wp2git Article_name_here
+
+`wp2git` will create a directory, in which a new git repository will be created.
+
+Run `wp2git --help` for more options.
+
+### Requirements
+
+The commands `git` and `curl` should be accessible from `PATH`.
+
+### Building
+
+You will need a [D compiler](http://dlang.org/download.html) to build `wp2git`.
+
+    $ git clone --recursive https://github.com/CyberShadow/wp2git
+    $ rdmd --build-only wp2git