Create README.md

Added README with instructions for adding to data jsons

docs/home-data/README.md

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+### Tutorials
+
+Tutorials (tutorial-data.json) is used to display highlighted tutorials and resources on the user's home page.
+Each object will be displayed on a grid. The total number of objects should be divisible by 3 to avoid blank spaces.
+
+Properties:
+- type - Tutorial or Video, new types can be added
+- title 
+- description - Truncated at 100 characters (to the nearest word)
+- link
+
+### Updates
+
+Updates (update-data.json) is used to display lists of 'major updates' and 'minor updates' on the user's home page.
+
+Old updates should be removed if the list gets too long.
+
+Properties:
+- content - The update description. Should be short so it fits on one line, approximately 50 characters
+- date - Date string in the format m/d/yyyy
+- type - major, minor, or bugfix
+- productArea - used only for major updates, sets the update icon to the appropriate product area
+- changesetNum - The number of the changeset with the update. Can be found on azure under repos/changesets