Update README.md

Author: Wei

README.md

@@ -212,6 +212,12 @@ new_local_repository(
 bazel build //:libtorchtrt --compilation_mode opt
 ```
 
+### FX path only installatioin
+If the user plan to try FX path only and would like avoid bazel build. 
+``` shell
+cd py && python3 setup.py install --fx-only
+```
+
 ### Debug build
 
 ``` shell
@@ -316,4 +322,4 @@ Take a look at the [CONTRIBUTING.md](CONTRIBUTING.md)
 
 ## License
 
-The Torch-TensorRT license can be found in the LICENSE file. It is licensed with a BSD Style licence
+The Torch-TensorRT license can be found in the LICENSE file. It is licensed with a BSD Style licence