CONTRIBUTING: Add docs for creating PRs

CONTRIBUTING.md

@@ -10,3 +10,10 @@ Issues serve two purposes:
 For any questions, you should use [the Q&A discussions page](https://github.com/Serial-ATA/lofty-rs/discussions/categories/q-a).
 
 ## [Pull Requests](doc/PULL_REQUESTS.md)
+
+[Creating a PR](doc/PULL_REQUESTS.md#creating-a-pr)
+
+For major contributions:
+
+* [Creating a new file type](doc/NEW_FILE.md)
+* [Creating a new tag type](doc/NEW_TAG.md)

doc/PULL_REQUESTS.md

@@ -1 +1,55 @@
 # Pull Requests
+
+## Table of Contents
+
+1. [Before Creating a PR](#before-creating-a-pr)
+2. [Creating a PR](#creating-a-pr)
+	* [PR Title](#pr-title)
+	* [PR Summary](#pr-summary)
+	* [Formatting, Linting, Etc.](#formatting-linting-etc)
+	* [Tests](#tests)
+
+## Before Creating a PR
+
+Before you create a PR, we ask that you do the following:
+
+1. **If fixing a bug, make an issue first**: The issue tracker should have a searchable history of
+bugs reports.
+
+2. **If adding a feature, make an issue or discussion first**: Features should be discussed prior to implementation.
+
+## Creating a PR
+
+There are two additional documents covering more substantial contributions:
+
+* [Creating a new file type](NEW_FILE.md)
+* [Creating a new tag type](NEW_TAG.md)
+
+The rest of this document covers general PR procedures.
+
+### PR Title
+
+See [Issue Title](ISSUES.md#issue-title).
+
+### PR Summary
+
+Please provide a description of the change(s) made, unless they can be easily inferred from the title.
+This should only provide a brief overview of the implementation details, with relevant links to specifications,
+issues, etc.
+
+Also be sure to mention the issue associated with the PR like so: "closes #10".
+
+### Formatting, Linting, Etc.
+
+Lofty uses the traditional tools `rustfmt`, `clippy`, and `rustdoc` to keep a consistent style and maintain
+correctness.
+
+Prior to finalizing a PR, it is a good idea to run `cargo fmt`, `cargo clippy`, and `cargo doc` to ensure
+there are no errors. These commands are also run in CI using the latest stable Rust.
+
+### Tests
+
+It is incredibly important that a PR provides tests for any behavioral changes.
+
+* When fixing a bug, create a test that mirrors the reproducer provided in the issue.
+* When adding a feature, create tests for any new additions made where sensible