update readme to be markdown based

README.txt → README.md

 libgit2 - the Git linkable library
-==================================
+======================
 
 libgit2 is a portable, pure C implementation of the Git core methods provided as a
 re-entrant linkable library with a solid API, allowing you to write native
 speed custom Git applications in any language with bindings.
 
 Why Do We Need It
-==================================
+=======================
 
 In the current Git project, though a libgit.a file is produced it is
 not re-entrant (it will call <code>die()</code> on basically any error)
@@ -26,6 +26,7 @@ What It Can Do
 ==================================
 
 libgit2 is already very usable.
+
 * raw <-> hex SHA conversions
 * raw object reading (loose and packed)
 * raw object writing (loose)
@@ -40,13 +41,13 @@ Building libgit2 - Unix systems
 In Unix-like systems, like Linux, *BSD and Mac OS X, libgit2 has
 the following dependencies:
 
-	- Python 2.5-3.1 <http://www.python.org>
+* Python 2.5-3.1 <http://www.python.org>
   Used by run the build system; no extra libraries required.
   Should probably ship installed with your OS.
 
-	- zlib 1.2+ <http://www.zlib.net/>
+* zlib 1.2+ <http://www.zlib.net/>
 
-	- LibSSL <http://www.openssl.org/>
+* LibSSL <http://www.openssl.org/>
   Only needed if you want to re-use OpenSSL's SHA1 routines;
   libgit2 compiles its own routines by default.
 
@@ -73,16 +74,16 @@ Building libgit2 - Windows MSVC++
 When building under Windows using the MSVC compiler, libgit2 has
 the following dependencies:
 
-	- Python 2.5-3.1 <http://www.python.org>
+* Python 2.5-3.1 <http://www.python.org>
   Used by run the build system; no extra libraries required.
 
-	- zlib 1.2+ (Windows API Version) <http://www.zlib.net/>
+* zlib 1.2+ (Windows API Version) <http://www.zlib.net/>
   Make sure you compile the ZLib library using the MSVC solution
   that ships in its source distribution.
   Alternatively, you may download precompiled binaries from:
      http://www.winimage.com/zLibDll/
 
-	- LibSSL <http://www.openssl.org/>
+* LibSSL <http://www.openssl.org/>
   Only needed if you want to re-use OpenSSL's SHA1 routines;
   libgit2 compiles its own routines by default.
 
@@ -108,15 +109,15 @@ Building libgit2 - Windows MinGW
 When building under Windows using the GCC compiler that ships with MinGW,
 libgit2 has the following dependencies:
 
-	- Python 2.5-3.1 <http://www.python.org>
+* Python 2.5-3.1 <http://www.python.org>
   Used by run the build system; no extra libraries required.
 
-	- zlib 1.2+ <http://www.zlib.net/>
+* zlib 1.2+ <http://www.zlib.net/>
 
-	- pthreads-w32 <http://sourceware.org/pthreads-win32/>
+* pthreads-w32 <http://sourceware.org/pthreads-win32/>
   Or an equivalent pthreads implementation for non-POSIX systems
 
-	- LibSSL <http://www.openssl.org/>
+* LibSSL <http://www.openssl.org/>
   Only needed if you want to re-use OpenSSL's SHA1 routines;
   libgit2 compiles its own routines by default.
 
@@ -162,26 +163,46 @@ Language Bindings
 So you want to use Git from your favorite programming language.  Here are
 the bindings to libgit2 that are currently available:
 
-== Ruby ==
+Ruby
+--------------------
 
-Ribbit is the reference library used to make sure the 
+Rugged is the reference library used to make sure the
 libgit2 API is sane.  This should be mostly up to date.
 
-http://github.com/libgit2/ribbit
+[[https://github.com/libgit2/rugged]]
+
 
+Python
+--------------------
 
-== Erlang ==
+Pygit2 is a Python binding to libgit2.
+
+[[https://github.com/libgit2/pygit2]]
+
+Erlang
+--------------------
 
 Geef is an example of an Erlang NIF binding to libgit2.  A bit out of 
 date, but basically works.  Best as a proof of concept of what you could
 do with Erlang and NIFs with libgit2.
 
-http://github.com/schacon/geef
-
+[[https://github.com/schacon/geef]]
 
 If you start another language binding to libgit2, please let us know so
 we can add it to the list.
 
+How Can I Contribute
+==================================
+
+Fork libgit2/libgit2 on GitHub, add your improvement, push it to a branch
+in your fork named for the topic, send a pull request.
+
+You can also file bugs or feature requests under the libgit2 project on
+GitHub, or join us on the mailing list by sending an email to:
+
+libgit2@librelist.com
+
+
 License 
 ==================================
 libgit2 is under GPL2 with linking exemption, which basically means you