CXX-74 convert README to markdown and add travis badge

Author: TylerBrock

README renamed to README.md

@@ -1,5 +1,4 @@
-MongoDB Legacy C++ Driver README
-
+# MongoDB Legacy C++ Driver [![Build Status](https://travis-ci.org/mongodb/mongo-cxx-driver.png?branch=legacy)](https://travis-ci.org/mongodb/mongo-cxx-driver)
 Welcome to the MongoDB Legacy C++ Driver!
 
 This driver is an extraction of the "Server C++ Driver" from the primary
@@ -8,35 +7,35 @@ from the server sources if at all possible. Please note that as of
 MongoDB 2.6.0-rc1, it is no longer possible to build the driver from
 the server sources: this repo is the only approved source for driver builds.
 
-COMPONENTS
+## Components
 
   libmongoclient.[so|dylib|dll] - The shared mongoclient library
   libmongoclient.a - The static mongoclient library (but see notes)
 
-BUILDING
+## Building
 
   See http://docs.mongodb.org/ecosystem/tutorial/download-and-compile-cpp-driver/
 
   The above instructions (currently) assume that you are building from the server
   repository, but the will work with this repository as described.
 
-NOTES
+## Notes
 
   Use of the static library is discouraged, and support may be removed soon. To properly
   link against the static library on ELF platforms, you must link it with the
   --whole-archive flag to ld. The static library is not useable on Windows since
   there is no analogue to --whole-archive. The static library may work on OS X, but
   we still strongly recommend using the dynamic library.
 
-DOCUMENTATION
+## Documentation
 
   http://docs.mongodb.org/ecosystem/drivers/cpp/
 
-MAIL LISTS AND IRC
+## Mailing Lists and IRC
 
   http://dochub.mongodb.org/core/community
 
-LICENSE
+## Licencse
 
   The source files in this repository are made available under the terms of the
   Apache License, version 2.0.