Add previous versions section

Author: atalman

_get_started/previous-versions.md

@@ -17,6 +17,53 @@ your convenience.
 
 ## Commands for Versions >= 1.0.0
 
+### v1.12.1
+
+#### Conda
+
+##### OSX
+
+```
+# conda
+conda install pytorch==1.12.1 torchvision==0.13.1 torchaudio==0.12.1 -c pytorch
+```
+
+#####  Linux and Windows
+
+```
+# CUDA 10.2
+conda install pytorch==1.12.1 torchvision==0.13.1 torchaudio==0.12.1 cudatoolkit=10.2 -c pytorch
+# CUDA 11.3
+conda install pytorch==1.12.1 torchvision==0.13.1 torchaudio==0.12.1 cudatoolkit=11.3 -c pytorch
+# CUDA 11.6
+conda install pytorch==1.12.1 torchvision==0.13.1 torchaudio==0.12.1 cudatoolkit=11.6 -c pytorch -c conda-forge
+# CPU Only
+conda install pytorch==1.12.1 torchvision==0.13.1 torchaudio==0.12.1 cpuonly -c pytorch
+```
+
+#### Wheel
+
+##### OSX
+
+```
+pip install torch==1.12.1 torchvision==0.13.1 torchaudio==0.12.1
+```
+
+##### Linux and Windows
+
+```
+# ROCM 5.1.1 (Linux only)
+pip install torch==1.12.1+rocm5.1.1 torchvision==0.13.1+rocm5.1.1 torchaudio==0.12.1 --extra-index-url  https://download.pytorch.org/whl/rocm5.1.1
+# CUDA 11.6
+pip install torch==1.12.1+cu116 torchvision==0.13.1+cu116 torchaudio==0.12.1 --extra-index-url https://download.pytorch.org/whl/cu116
+# CUDA 11.3
+pip install torch==1.12.1+cu113 torchvision==0.13.1+cu113 torchaudio==0.12.1 --extra-index-url https://download.pytorch.org/whl/cu113
+# CUDA 10.2
+pip install torch==1.12.1+cu102 torchvision==0.13.1+cu102 torchaudio==0.12.1 --extra-index-url https://download.pytorch.org/whl/cu102
+# CPU only
+pip install torch==1.12.1+cpu torchvision==0.13.1+cpu torchaudio==0.12.1 --extra-index-url https://download.pytorch.org/whl/cpu
+```
+
 ### v1.12.0
 
 #### Conda
@@ -52,7 +99,7 @@ pip install torch==1.12.0 torchvision==0.13.0 torchaudio==0.12.0
 ##### Linux and Windows
 
 ```
-# ROCM 5.1.1 (Linux only
+# ROCM 5.1.1 (Linux only)
 pip install torch==1.12.0+rocm5.1.1 torchvision==0.13.0+rocm5.1.1 torchaudio==0.12.0 --extra-index-url  https://download.pytorch.org/whl/rocm5.1.1
 # CUDA 11.6
 pip install torch==1.12.0+cu116 torchvision==0.13.0+cu116 torchaudio==0.12.0 --extra-index-url https://download.pytorch.org/whl/cu116