added README

README.md

+# Franka Gripper Package
+
+Forked juli 2020 and extended with adaption of applied forces.
+
+Original repository: https://github.com/frankaemika/franka_ros/tree/kinetic-devel/franka_gripper
+
+## How to install it
+
+* navigate into the src-folder of your workspace
+* create a folder with the name "franka_ros"
+* cd into the franka_ros folder
+* clone this repository inside the franka_ros folder
+
+## How to modify applied forces
+
+You can do this by the configuration of one parameter in the parameter-server of ROS.
+The parameter "tud_grasp_force", which accepts the force in Newton as parameter.
+Optimal parameter range is tested from 5 N to 14 N.