README: New section for Gradle snapshot instructions

README.md

@@ -130,6 +130,25 @@ kotlin {
 > binaries. For example, [here is Kotter's CI workflow](https://github.com/varabyte/kotter/blob/main/.github/workflows/publish.yml)
 > which runs on both Linux and Mac targets to build platform-specific Kotter artifacts.
 
+#### Testing snapshots
+
+Most users won't ever need to run a Kotter snapshot, so feel free to skip over this section! However, occasionally, bug
+fixes and new features will be available for testing for a short period before they are released.
+
+If you ever file a bug with Kotter and are asked to test a fix using a snapshot, you must add an entry for the sonatype
+snapshots repository to your `repositories` block in order to allow Gradle to find it:
+
+```kotlin
+// build.gradle.kts
+
+repositories {
+  mavenCentral()
+  // ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
+  maven("https://s01.oss.sonatype.org/content/repositories/snapshots/")
+  // ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
+}
+```
+
 ### 🚥 Running examples
 
 If you've cloned this repository, examples are located under the [examples](examples) folder.