Update README

README.md

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 # slslam
-Building a 3D Line-based Map Using a Stereo SLAM
+This implementation performs Stereo Line-based SLAM (SLSLAM) of our work:
+"Building a 3D Line-based Map Using a Stereo SLAM," currently in a revision
+process of IEEE Transactions on Robotics.
+
+Dependencies: Ceres-solver 1.7.0, OpenCV 2.4.10, Google Flags 2.1.0, Google
+Logging 0.0.0, OpenGL, GLFW
+
+All dependencies should be installed in your system beforehand.
+
+This code has been tested only on 64-bit linux (Ubuntu 14.04) system.
+
+First download the code:
+$ git clone https://github.com/slslam/slslam.git
+
+Then download a zipped dataset file from:
+https://drive.google.com/file/d/0B3bB8rHbc3fWNGQ3YnhLczIwNG8/view?usp=sharing
+and copy it to ${source_root_dir}.
+
+$ unzip data.zip
+$ mkdir build && cd build
+$ cmake ..
+$ make