chore-add | added java dependency (#54)

* chore-add | added java dependency

* Update vault-to-tink/README.md

Co-authored-by: Ryan William O'Hara <ryanwohara@users.noreply.github.com>

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Co-authored-by: Ryan William O'Hara <ryanwohara@users.noreply.github.com>

Author: atulsingh0

vault-to-tink/README.md

@@ -12,6 +12,8 @@
    - If Postgres has been externalized, please reach out to your account representative.
 
 1. You have a [Tink keyset](https://developers.google.com/tink/install-tinkey) ready to go with `tinkey create-keyset --key-template XCHACHA20_POLY1305`
+   - To successfully run the aforementioned command, Java must be installed. On a Mac you may `brew install openjdk`.
+
 1. If on a Mac, please `brew install iproute2mac`
 
 Note: This script will open one REPL per context ID, where one ID is one context; not to be confused with individual variables within a context. If you have a firewall that will rate-limit you, please take that into consideration before proceeding.