Merge branch 'app-engine-api'

Author: fonsp

julia-runtime/.gitignore

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+use_local_pluto.txt

julia-runtime/Manifest.toml

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+# To update the Pluto version used by the extension
+Edit `PLUTO_BRANCH_NAME` in `extension.ts`
+
+# To run a local install of Pluto
+If you want to use you local version of Pluto, then create a file in this folder called
+```
+use_local_pluto.txt
+```
+
+With you favourite emoji inside!
+
+If the file exists, our runner will use your global Julia environment to run Pluto.
+
+
+
+> This file is `.gitignore`d, but be sure to test the extension without this file! Remember to update Pluto if you made any necessary changes.