Add .tool-versions file and document asdf (#26)

Co-authored-by: Anna Headley <[email protected]>
pulibrary · Feb 1, 2023 · 64b66e5 · 64b66e5
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diff --git a/.tool-versions b/.tool-versions
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+ruby 3.2.0
diff --git a/README.md b/README.md
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 # imagecat-rails
-A rewrite of imagecat.princeton.edu 
+
+A rewrite of a imagecat.princeton.edu 
 ---
 This catalog contains records for items cataloged before 1980.
 Records are arranged alphabetically with authors, titles, and subjects interfiled.
 
+## System dependencies
+
+This project uses [asdf](https://asdf-vm.com/) (see .tool-versions for the current ruby version)