Updated docs: Execution Provider overview (#5328)
* Update ReleaseManagement.md
* Create ONNX_Runtime_Execution_Providers.md
* Create ONNX_Runtime_EP3.png
* Create ONNX_Runtime_EP2.png
* Create ONNX_Runtime_EP1.png
* Delete ONNX_Runtime_Execution_Providers.md
* Create README.md
* Update README.md
* commit
* Updated in error.
Revert "Update ReleaseManagement.md"
This reverts commit 8530bd5fd46aebce3a6d6055d8952ae4f6458c4e.
* Create ONNX_Runtime_Execution_Providers.md
* Create ONNX_Runtime_EP3.png
* Create ONNX_Runtime_EP2.png
* Create ONNX_Runtime_EP1.png
* Delete ONNX_Runtime_Execution_Providers.md
* Create README.md
* Update README.md
* commit
* Updated in error.
Revert "Update ReleaseManagement.md"
This reverts commit 8530bd5fd46aebce3a6d6055d8952ae4f6458c4e.
* Update ReleaseManagement.md
* Update .gitignore
* Update README.md
* Update README.md