Update README.md

README.md

 # Library Sandbox
 
 ## Before launching your application
- - LD_LIBRARY_PATH must contain dir's path to libsandbox.so
- - Enter this command in the terminal where you are using your application
+ - LD_LIBRARY_PATH must contain the path to the directory containing libsandbox.so (which is generated in /build)
+ - Enter this command in the terminal executing your applications
+
 ```
-REALTIVE_PATH_TO_SO=../../ar_sandbox_lib/build && \
-export LD_LIBRARY_PATH=$(pwd)/$REALTIVE_PATH_TO_SO
+export LD_LIBRARY_PATH=$(pwd)/$RELATIVE_PATH_TO_SO
 ```
+
+ - Where $REALTIVE_PATH_TO_SO is the relative path to the generated file libsandbox.so from the current path of your terminal
+ - Don't forget that LD_LIBRARY_PATH is local to each terminal
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