change readme

Author: sweetdream779

README.md

@@ -8,4 +8,6 @@ This app demonstrate semi realtime traffic signs, pedestrians and cars detection
 To run app:
 1. Install tensorflow 
 
-2. Change paths 'tensorflow_root' (folder with tensorflow) and 'bazelLocation'(folder with bazel) in build.gradle
+2. Change paths 'tensorflow_root' (folder with tensorflow) and 'bazelLocation'(folder with bazel) in build.gradle 
+
+3. Change path TF_SRC_ROOT to folder with tensorflow in CMakeLists.txt