docs: Add correct pip install instructions (#1400)

* Add correct pip install instructions

* add dependencies to toml

Author: msaroufim

README.md

@@ -122,6 +122,10 @@ These are the following dependencies used to verify the testcases. Torch-TensorR
 
 Releases: https://github.com/pytorch/TensorRT/releases
 
+```
+pip install torch-tensorrt==1.2.0 --find-links https://github.com/pytorch/TensorRT/releases/expanded_assets/v1.2.0
+```
+
 ## Compiling Torch-TensorRT
 
 ### Installing Dependencies

pyproject.toml

@@ -9,6 +9,8 @@ requires = [
     "cffi",
     "typing_extensions",
     "future",
+    "nvidia-pyindex",
+    "nvidia-tensorrt==8.4.3.1"
 ]
 
 # Use legacy backend to import local packages in setup.py