Update GOVERNANCE.md (#762)

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Linking SC and Maintainers

Signed-off-by: Grace <89099268+graceCode100@users.noreply.github.com>

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Signed-off-by: Grace <89099268+graceCode100@users.noreply.github.com>

* Update GOVERNANCE.md

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Signed-off-by: Grace <89099268+graceCode100@users.noreply.github.com>
Co-authored-by: Adam Mollis <36461279+AMollis@users.noreply.github.com>

Author: graceCode100

GOVERNANCE.md

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 This document provides the governance policy for the Mixed Reality Toolkit for Unity Project. Maintainers agree to this policy and to abide by all Project polices, including the [code of conduct](../org-docs/CODE-OF-CONDUCT.md), [trademark policy](../org-docs/TRADEMARKS.md), and [antitrust policy](../org-docs/ANTITRUST.md) by adding their name to the [MAINTAINERS.md](./MAINTAINERS.md) file.
 
+All projects under the Mixed Reality Toolkit organization are governed by the Steering Committee. The Steering Committee is responsible for all technical oversight, project approval and oversight, policy oversight, and trademark management for the Organization. To learn more about the Steering Committee, visit this link: https://github.com/MixedRealityToolkit/MixedRealityToolkit-MVG/blob/main/org-docs/CHARTER.md
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 ## 1. Roles
 
 This project may include the following roles. Additional roles may be adopted and documented by the Project.