Add subproject SSC representative term length to documentation (#140)

* Create governance documentation
* Update governance note on community documentation

Co-authored-by: gabalafou <gabriel@fouasnon.com>

docs/community/governance.md

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+# Jupyter Accessibility Governance
+
+Jupyter Accessibility is a [Project Jupyter Software Subproject](https://jupyter.org/governance/list_of_subprojects.html). 
+
+The [jupyter/accessibility](https://github.com/jupyter/accessibility) repository serves as our project's team compass, our central location for effort coordination, updates, and governance.
+
+## Subproject-specific governance
+
+The Jupyter Accessibility subproject follows the [Project Jupyter Software Subproject documentation](https://jupyter.org/governance/software_subprojects.html). Additional aspects of governance left to our subproject's own discretion are listed here.
+
+### Software Steering Council representative
+
+As a Software Subproject, the Jupyter Accessibility council elects one council member to be the project's representative to the [Project Jupyter Software Steering Council (SSC)](https://jupyter.org/governance/software_steering_council.html).
+
+- The term length for a Jupyter Accessibility SSC representative is one year. Elections are to be run within the council annually.
+- There is no cap on number of terms served by a Jupyter Accessibility SSC representative. There is no limit on consecutive terms served.

docs/community/index.md

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 # Community Calls and Events
 
 ```{note}
-The Jupyter Accessibility project was recently converted into an [official Jupyter Software Subproject](https://jupyter.org/governance/software_subprojects.html).
-We are currently working on our governance and decision making, please bear with us while we get this sorted.
+The Jupyter Accessibility project was recently converted into an official Jupyter Software Subproject.
+Learn more on [our governance documentation](governance.md)
 ```
 
 ## Get Connected with the Community