Update 'ReadMe.md'

ReadMe.md

@@ -4,6 +4,17 @@
 
 ### Requirements
 1. Ubuntu 20.04
-2. OpenCV 4 with contrib and libgdal included: https://docs.opencv.org/4.x/d7/d9f/tutorial_linux_install.html 
-2. ROS noetic, install only ROS fromm this guide (do not install open_vins): https://docs.openvins.com/gs-installing.html
-3. 
+2. OpenCV 3 with contrib and libgdal included: https://docs.opencv.org/4.x/d7/d9f/tutorial_linux_install.html. If catkin buld will be complaining that OpenCV is not found, please set the variable in CMakeLists.txt for each package: set(OpenCV_DIR "path_to_opencv_build_directory")
+3. ROS noetic, install only ROS fromm this guide (do not install open_vins): https://docs.openvins.com/gs-installing.html
+4. KAIST Urban dataset. On the server: /mnt/disk-small
+
+### Building
+1. `mkdir -p ~/workspace/catkin_ws_ov/src/ && cd ~/workspace/catkin_ws_ov/src`
+2. `git clone https://git.drivecast.tech/pi/openvins_linux.git`
+3. `cd ../`
+4. `catkin build`
+
+### Running
+1. from terminal in `~/workspace/catkin_ws_ov/` directory `source devel/setup.bash` and then `roslaunch ov_msckf subscribe.launch config:=kaist` 
+
+