📖 revert PAT scope change and document Go resources (#4003)

* undo pat scope doc change

Signed-off-by: Spencer Schrock <sschrock@google.com>

* add Go resources

some contributors may be unfamiliar with the language

Signed-off-by: Spencer Schrock <sschrock@google.com>

---------

Signed-off-by: Spencer Schrock <sschrock@google.com>

CONTRIBUTING.md

@@ -18,6 +18,7 @@ project. This document describes the contribution guidelines for the project.
 * [Contributing code](#contributing-code)
   * [Getting started](#getting-started)
   * [Environment Setup](#environment-setup)
+  * [New to Go?](#new-to-go)
 * [Contributing steps](#contributing-steps)
 * [How to build scorecard locally](#how-to-build-scorecard-locally)
 * [PR Process](#pr-process)
@@ -62,6 +63,15 @@ You may need these tools for some tasks:
 
 1.  [`docker`](https://docs.docker.com/engine/install/): `v18.9` or higher.
 
+### New to Go?
+
+If you're unfamiliar with the language, there are plenty of articles, resources, and books.
+We recommend starting with several resources from the official Go website:
+
+* [How to Write Go Code](https://go.dev/doc/code)
+* [A Tour of Go](https://go.dev/tour/)
+* [Effective Go](https://go.dev/doc/effective_go)
+
 ## Contributing steps
 
 1.  Identify an existing issue you would like to work on, or submit an issue describing your proposed change to the repo in question.
@@ -180,7 +190,9 @@ make fix-linter
 
 ## Permission for GitHub personal access tokens
 
-For public repos, classic personal access tokens do not need any scopes.
+For public repos, classic personal access tokens need the following scopes:
+
+- `public_repo` - Read/write access to public repositories. Needed for branch protection
 
 ## Where the CI Tests are configured