Added data access pages

docs/data_access.md

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+---
+title: Data Access
+layout: default
+nav_order: 5
+---
+
+# Data Access
+
+---
+
+In return for the UK's in-kind contributions to the Vera C. Rubin project, UK-based astronomers can request proprietary access to LSST data. This includes access to the Data Preview 0 datasets that are used during the *Introduction to the RSP* tutorials.
+
+The UK's in-kind package is valued at earning data rights for 300 PI's (PI = Faculty staff or senior fellow) and 1200 Junior Associates (JA = PhD students, postdocs) which is deemed to be sufficient to meet expected demand.
+
+Since the number of UK-based PIs and JAs is limited, people who wish to hold data access rights need to apply to be awarded those rights. There is a call for applications roughly every six months, with the announcement of the calls made via the **lusc-announce** mailing list.
+
+Instructions for how to join the lusc-announce mailing list are provided [here](https://lsst-uk.atlassian.net/wiki/spaces/HOME/pages/24313864/LSST+UK+Announcements+Email+List).