add stable Conda install notes for MacOS

Conda_Install_Guideline.md

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+# GraphGym - Simple Stable Install for MacOS and M1 laptops
+GraphGym is a platform for designing and evaluating Graph Neural Networks (GNN).
+GraphGym is proposed in *[Design Space for Graph Neural Networks](https://arxiv.org/abs/2011.08843)*, 
+Jiaxuan You, Rex Ying, Jure Leskovec, **NeurIPS 2020 Spotlight**.
+
+Please also refer to [PyG](https://www.pyg.org) for a tightly integrated version of GraphGym and PyG.
+
+The following is a step-by-step guideline for setting up a failsafe stable version of GraphGym on any laptop operating system. We provide the instructions for MacOS 12.4 with the Apple Silicon M1 chip as a demo. If intending to run ROLAND as a use case, please complete these steps first to create the Conda Environment, and proceed with installing roland_environment_M1.yml. Happy coding! 
+
+
+```bash
+conda update conda
+
+# creates new Conda environment named GraphGymM1, but feel free to name the environment anything you'd like
+conda create -n GraphGymM1  python=3.9
+
+conda activate GrapahGymM1
+
+# This is critical for all Apple Silicon installations
+conda install -y clang_osx-arm64 clangxx_osx-arm64 gfortran_osx-arm64
+
+# please change 12.4 to your target operating system version. This torch version has been verified to work 
+MACOSX_DEPLOYMENT_TARGET=12.4 CC=clang CXX=clang++ python -m pip --no-cache-dir   install torch==1.11.0 torchvision torchaudio
+
+# Check the torch version is correct, this is particularly important if running ROLAND use case
+python -c "import torch; print(torch.__version__)"  #---> (Confirm the version is 1.12.1 or 1.11 for ROLAND)
+
+# must install the following packages specifically, paying attention to version numbers. The following versions are needed to run ROLAND. 
+MACOSX_DEPLOYMENT_TARGET=12.4 CC=clang CXX=clang++ python -m pip --no-cache-dir  install  torch-scatter==2.0.9 -f https://data.pyg.org/whl/torch-1.11+${cpu}.html
+
+MACOSX_DEPLOYMENT_TARGET=12.4 CC=clang CXX=clang++ python -m pip --no-cache-dir  install  torch-sparse==0.6.13 -f https://data.pyg.org/whl/torch-1.12.1+${cpu}.html
+
+MACOSX_DEPLOYMENT_TARGET=12.4 CC=clang CXX=clang++ python -m pip --no-cache-dir  install  torch-spline-conv==1.2.1 -f https://data.pyg.org/whl/torch-1.11+${cpu}.html
+
+MACOSX_DEPLOYMENT_TARGET=12.4 CC=clang CXX=clang++ python -m pip --no-cache-dir  install  torch-geometric
+
+MACOSX_DEPLOYMENT_TARGET=12.4 CC=clang CXX=clang++ python -m pip --no-cache-dir  install matplotlib
+
+MACOSX_DEPLOYMENT_TARGET=12.4 CC=clang CXX=clang++ python -m pip --no-cache-dir  install networkx
+```
+
+**Running ROLAND Use Case**
+
+If running ROLAND use case, please install Conda via the roland_environment_M1.yml.
+
+```bash
+conda env create --name {your name} -f roland_environment_M1.yml
+./install.sh
+
+python setup.py install 
+
+# paying attention to use the right pip
+python -m pip {your install}
+```