Merge pull request #18 from lcskrishna/cl/readme-updates

[Documentation] Update the readme for ROCm.

README.md

@@ -115,8 +115,27 @@ It's often convenient to use Apex in Docker containers.  Compatible options incl
 
 See the [Docker example folder](https://github.com/NVIDIA/apex/tree/master/examples/docker) for details.
 
+## On ROCm:
+* Python 3.6
+* Pytorch 1.5 or newer, The HIPExtensions require 1.5 or newer.
+* We recommend follow the instructions from [ROCm-Pytorch](https://github.com/ROCmSoftwarePlatform/pytorch) to install pytorch on ROCm.
+
 # Quick Start
 
+### Rocm
+Apex on ROCm supports both python only build and extension build.
+Note: Pytorch version recommended is >=1.5 for extension build.
+
+### To install using python only build use the following command in apex folder:
+```
+python3.6 setup.py install
+```
+
+### To install using extensions enabled use the following command in apex folder:
+```
+python3.6 setup.py install --cpp_ext --cuda_ext
+```
+
 ### Linux
 
 For performance and full functionality, we recommend installing Apex with