plugins: Add starship plugin (#628)

plugins/starship/README.md

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+# starship plugin
+
+Initializes [starship](https://github.com/starship/starship), the minimal, blazing-fast, and infinitely customizable prompt for any shell!
+
+To use it, add `starship` to the plugins array in your `.bashrc` file:
+
+```bash
+plugins=(... starship)
+```
+
+**Note:** you have to [install starship](https://github.com/starship/starship?tab=readme-ov-file#step-1-install-starship) first.
+
+## ⚠️ ENABLING THIS PLUGIN WILL UNSET YOUR OSH_THEME VARIABLE

plugins/starship/starship.plugin.sh

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+#! bash oh-my-bash.module
+
+# Check if starship is installed
+if _omb_util_command_exists starship; then
+    # ignore oh-my-bash theme
+    unset -v OSH_THEME
+    eval "$(starship init bash)"
+else
+    echo '[oh-my-bash] starship not found, please install it from https://github.com/starship/starship'
+fi