Add README

README.md

+# Public Utility Scripts
+The purpose of this repository is to create a collection of useful scripts and commands for common and repetitive activities.
+
+**WARNING:** Some of the use cases below involve piping scripts into bash. While this is convenient, doing it blindly is a security risk. Always review scripts and know what they do before piping into a shell!
+
+# Contents
+## `generate_svc_account_key.sh`
+**Example:** `bash <(curl -q -o - "https://git.unl.edu/unl-its/public-utility-scripts/-/raw/master/generate_svc_account_key.sh" 2>/dev/null)`
+
+**Description:** Generates an ed25519 SSH key for a service account, adds the public part to the service account's `authorized_keys` file, and prints the private part of the key to the console.
+The primary intended use of this script is generating keys for use wit GitLab CI.
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