docs: Add package name dir matching

Signed-off-by: Charlie Egan <[email protected]>

style-guide.md

@@ -51,6 +51,8 @@ Rego policies. If you enjoy this style guide, make sure to check it out!
   * [Avoid using the last argument for the return value](#avoid-using-the-last-argument-for-the-return-value)
 * [Regex](#regex)
   * [Use raw strings for regex patterns](#use-raw-strings-for-regex-patterns)
+* [Packages](#packages)
+  * [Package name should make file location](#package-name-should-make-file-location)
 * [Imports](#imports)
   * [Prefer importing packages over rules and functions](#prefer-importing-packages-over-rules-and-functions)
   * [Avoid importing `input`](#avoid-importing-input)
@@ -966,6 +968,32 @@ You can lint for this recommendation using the [`non-raw-regex-pattern`](https:/
 Regal rule. Get started with [Regal, the Rego linter](https://docs.styra.com/regal).
 :::
 
+## Packages
+
+### Package name should make file location
+
+When naming packages, the package name should reflect the file's location. This
+makes the package implementation easier to find when looking up from elsewhere
+in a project as well.
+
+**Avoid**
+
+```rego
+# foo/bar.rego
+package bar.foo
+
+# ...
+```
+
+**Prefer**
+
+```rego
+# foo/bar.rego
+package foo.bar
+
+# ...
+```
+
 ## Imports
 
 ### Prefer importing packages over rules and functions