docs: add contributor ladder

docs/community/contributor_ladder.mdx

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+---
+title: Contributor Ladder
+sidebar_position: 40
+---
+
+# Contributor Ladder
+
+* [Contributor Ladder](#contributor-ladder)
+    * [Contributor](#contributor)
+    * [Owners Structure](#owners-structure)
+* [Inactivity](#inactivity)
+* [Involuntary Removal](#involuntary-removal-or-demotion)
+* [Stepping Down/Emeritus Process](#stepping-downemeritus-process)
+* [Contact](#contact)
+
+
+## Contributor Ladder
+
+Hello! We are excited that you want to learn more about our project contributor ladder! 
+This contributor ladder outlines the different contributor roles within the project, 
+along with the responsibilities and privileges that come with them. 
+Community members generally start at the first levels of the "ladder" and advance up it as their involvement in the project grows.
+Our project members are happy to help you advance along the contributor ladder.
+
+Each of the contributor roles below is organized into three sections. 
+"Responsibilities" are tasks that a contributor is expected to do. 
+"Requirements" are qualifications a person needs to meet to be in that role, 
+and "Privileges" are rights contributors on that level are entitled to.
+
+### Contributor
+A Contributor directly adds value to the project. 
+Contributions need not be code. 
+Individuals at the Contributor level may be new contributors, 
+or they may only contribute occasionally.
+
+* Responsibilities include:
+    * Follow the [CNCF CoC](https://github.com/cncf/foundation/blob/master/code-of-conduct.md)
+    * Follow the project [contributing guide](./contributing_guide.mdx)
+    * Participation in community Slack channel(s)
+* Requirements (one or several of the below):
+    * Report and sometimes resolve issues
+    * Occasionally submit PRs
+    * Contribute to the documentation
+    * Attend project meetings, take notes
+    * Answer questions from other community members
+    * Submit feedback on issues and PRs
+    * Test releases and patches and submit reviews
+    * Run or helps run events
+    * Promote the project in public
+    * Help run the project infrastructure
+* Privileges:
+    * Invitations to contributor events
+    * Eligible to become an Organization Member
+
+### Owners Structure
+There are two types of owners in the ORAS project hierarchy: organization owners and subproject owners.
+ORAS organization owners oversee the overall project and its health. 
+Subproject owners focus on a single repository, 
+a group of related repositories, 
+a service (e.g., a website), 
+or subproject to support the other subprojects (e.g., marketing or community management).
+
+Changes in ORAS Organization owners have to be announced via an 
+[issue on the Community repository](https://github.com/oras-project/community/issues). 
+Changes to sub-project owners are to be announced via the appropriate sub-project issue.
+
+You can find more information on the roles of organization owners and 
+subproject owners in the [governance](https://github.com/oras-project/community/blob/main/governance/GOVERNANCE.md).
+
+## Inactivity
+It is important for contributors to be and stay active to set an example and show commitment to the project. 
+Inactivity is harmful to the project as it may lead to unexpected delays, 
+contributor attrition, and a lost of trust in the project.
+
+* Inactivity is measured by:
+    * Periods of no contributions for longer than 6 months.
+    * Periods of no communication for longer than 6 months.
+* Consequences of being inactive include:
+    * Involuntary removal or demotion.
+    * Being asked to move to Emeritus status.
+
+## Involuntary Removal or Demotion
+
+Involuntary removal/demotion of a contributor happens when responsibilities and requirements aren't being met. 
+This may include repeated patterns of inactivity, extended period of inactivity, 
+a period of failing to meet the requirements of your role, 
+and/or a violation of the Code of Conduct. 
+This process is important because it protects the community and its deliverables while also opens up opportunities for new 
+contributors to step in.
+
+Involuntary removal or demotion is handled through a vote by a majority of the current Maintainers.
+
+## Stepping Down/Emeritus Process
+If and when contributors' commitment levels change, 
+contributors can consider stepping down (moving down the contributor ladder) vs moving to emeritus status 
+(completely stepping away from the project).
+
+Contact the Maintainers about changing to Emeritus status, 
+or reducing your contributor level.
+
+## Contact
+* For inquiries, please drop a message in the #oras channel in the CNCF Workspace. 
+You can follow the instructions in the [community resources](../community/community_resources.mdx#joining-the-slack-channel) 
+to join it.