add README

README.md

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+## GENERAL
+    
+    - This is a modification (5 links) of Mujoco Gym's Reacher (2 links)
+
+    - Creating a custom Mujoco Gym according to this guides: https://github.com/openai/gym/blob/master/docs/creating-environments.md
+
+## INSTALL
+    - NOTE: you should look into envs/reacher_env.py and change the link to .xml file.  
+    
+    - Install: go to "../reacher_5_links"        
+        ``` pip install -e reacher_5_links ```
+    - Use (see example.py): 
+        ``` env = gym.make('reacher:ReacherALREnv-v0')```