[PR PATCH] CONTRIBUTING.md: add instructions for testing PRs

[classabbyamp <classabbyamp@users.noreply.github.com>]

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There is a new pull request by classabbyamp against master on the void-packages repository

https://github.com/classabbyamp/void-packages contrib-testing
https://github.com/void-linux/void-packages/pull/38447

CONTRIBUTING.md: add instructions for testing PRs
I've had to find these instructions time and time again for requesting testing from people, so I figured why not make it part of our documentation. Maybe it will help get more users involved with testing.

Open to suggestions on wording, grammar, missing info, etc.


A patch file from https://github.com/void-linux/void-packages/pull/38447.patch is attached

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From 1222ddc6704bc7faeb809f24e87138c58c8d5151 Mon Sep 17 00:00:00 2001
From: classabbyamp <void@placeviolette.net>
Date: Wed, 3 Aug 2022 00:08:14 -0400
Subject: [PATCH] CONTRIBUTING.md: add instructions for testing PRs

---
 CONTRIBUTING.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index da3bef29c883..d74dd6203618 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -129,3 +129,24 @@ Please abstain from temporarily closing a pull request while revising the templa
 
 Once the reviewers have merged the pull request, our [build server](http://build.voidlinux.org) is automatically triggered and builds
 all packages in the pull request for all supported platforms. Upon completion, the packages are available to all Void Linux users.
+
+## Testing Pull Requests
+
+Testing new package submissions and updates is always helpful, and is a great way to get started with contributing.
+First, [clone the repository](https://github.com/void-linux/void-packages#quick-start) if you haven't done so already.
+Then check out the pull request, either with `github-cli`:
+
+    $ gh pr checkout <number>
+
+Or manually:
+
+    $ git fetch origin pull/<number>/head:<branch-name>
+    $ git checkout <branch-name>
+
+If your local void-packages repository is cloned from your fork, you may need to add the main repository as a remote first:
+
+    $ git remote add upstream https://github.com/void-linux/void-packages.git
+    $ git fetch upstream pull/<number>/head:<branch-name>
+    $ git checkout <branch-name>
+
+Then [build and install](https://github.com/void-linux/void-packages#building-packages) the package and test its functionality.