chore: add script for updating bower repos

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diff --git a/scripts/bower/README.md b/scripts/bower/README.md
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+# Angular Bower Script
+
+Script for updating the Angular bower repos from a code.angularjs.org package
+
+Requires `node` (for parsing `bower.json`) and `wget` (for fetching the `angular.zip` from `code.angularjs.org`)
+
+
+## Instructions
+
+You need to run `./init.sh` the first time you use this script to clone all the repos.
+
+For subsequent updates:
+
+```shell
+./publish.sh NEW_VERSION
+```
+
+Where `NEW_VERSION` is a version number like `1.2.3`.
+
+
+## License
+MIT
+