Proposal: Add Decentralized Data Stewardship WG (#353)

* Proposal: Add Decentralized Data Stewardship WG

This PR adds a new working group called Decentralized Data Stewardship. This will hold the work that @flyingzumwalt , @michellebrous and I are doing around supporting user research, collaborations, and products that deal with data management on the decentralized web. Some examples include: 

- Participating in groups such as [Data Together](https://datatogether.org/)
- Conducting [user research around managing large volumes of data](https://github.com/ipfs/user-research/tree/master/large-volumes) on IPFS
- Supporting collaborations between IPFS and community members who need to manage large volumes of data

@steverichmond requested this PR several days ago, and I know @flyingzumwalt was intending on submitting it, but got pulled into other things. Please consider this a first draft that I'm sure @flyingzumwalt will have edits to, but at least the 'placeholder' is there for the Q4 OKR process.

* add repo

TEAM_STRUCTURES.md

@@ -17,6 +17,7 @@
   - **Ongoing Efforts to Support Specific Uses:**
     - [Integration with Web Browsers](#integration-with-web-browsers)
     - [Dynamic Data and Capabilities](#dynamic-data-and-capabilities)
+    - [Decentralized Data Stewardship](#decentralized-data-stewardship)
 - [Existing **Research** Groups](#existing-research-groups)
 
 ## Description
@@ -194,6 +195,20 @@ Research and development of building blocks that enable collaborative applicatio
 - Research Cryptographic ACLs (Capabilities Systems) and create building blocks to implement them.
 - Apply this research and implementation to products like PeerPad, validating the solutions and defining new problems to be solved.
 
+### Decentralized Data Stewardship
+
+- **Coordination**: https://github.com/ipfs/decentralized-data-stewardship
+- **Captain**: [Michelle Hertzfeld](https://github.com/meiqimichelle)
+
+User research, collaborations, and products that support holding data together on decentralized networks.
+
+**Responsibilities include**:
+
+- Participate in groups such as [Data Together](https://datatogether.org/)
+- Conduct [user research around managing large volumes of data](https://github.com/ipfs/user-research/tree/master/large-volumes) on IPFS
+- Support collaborations between IPFS and community members who need to manage large volumes of data
+- Research and prototype policy layers for just and inclusive data stewardship on decentralized networks
+
 ## Existing Research Groups
 
 The list of existing research groups is: