Create sig_qualityofservice.md

Rucio QOS writeup

Author: dougbenjamin

docs/sig_qualityofservice.md

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+---
+id: sig_qualityofservice
+title: SIG QOS
+---
+
+## Objective
+
+The purpose of this SIG is to allow a RSE handle in an automatic manner storage
+with two different qualitiy of services based on access latency. Initial work in
+this area differentiates between disk and tape within the same RSE. New data files
+are initially pinned on disk either for the lifetime of the rule or up to the 
+maximum set by the storage site. After the pin expires the local storage system is
+free to stage the file to tape for further access. When Rucio needs to access such
+files again, the bring on line command is given to the RSE and the file is 
+transferred from tape to disk if needed. Currently this is being tested with dCache.
+In the future, it can be extended to other storage systems where appropriate.
+At the end of this SIG a report will be written documenting the status of this 
+activity. Rucio's metadata functionality or interested in using it, to ascertain if the 
+functionality currently provided in this area is sufficient for their current and 
+expected future use cases. This information will be distilled into the form of a 
+small report, where, if missing functionality is identified, the report will serve 
+to aggregate any similar requests and prioritise them, with the goal of delivering 
+a tentative roadmap to guide development.
+
+## Expected End-Date
+
+September 30, 2023
+
+## Means to achieve the objective
+
+- Mattermost channel: [#metadata](https://mattermost.web.cern.ch/rucio/channels/QoS)
+- eMail list: 
+- biweekly meetings with interested communities either over Zoom or asynchronously 
+  over Mattermost.
+
+## Convener
+
+[Matt Snyder](msnyder at bnl dot gov)