add note of branching

spacetelescope · Apr 16, 2021 · 18a91b5 · 18a91b5
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 # JWebbinar preparatory material
 
 This space is for internal use. Material for the JWebbinars can be added here for sharing and reviewing.
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+## Branch frozen for Webbinar 1
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+This Branch is a frozen version for Webbinar 1. If you want a version of the materials that is being maintained, see the `main` branch of this repository.