Some tweaks for release (#1)

* Some tweaks for release

This changes a few things to polish up the release.
- Bump copyright year since changes are being made to the code this year
- Add a proper readme with usage instructions
- Instead of specifying paper version 1.19.4, we tell the user to check
  the plugin page for the right version to upgrade to, since the new
  plugin system has been around for a while and a lot of plugins
  probably won't support 1.19 any more.

* Readme wording changes

Author: hjk321

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 PaperMC
+Copyright (c) 2024 PaperMC
                    Contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy

README.md

@@ -0,0 +1,38 @@
+# Paper Trail
+
+**Paper Trail** is a helper library for 
+notifying users of legacy server software 
+that a plugin requires Paper.
+The main use case for this library
+is for plugins that utilize the new
+Paper plugin system (`paper-plugin.yml`)
+and do not support the legacy plugin system
+(`plugin.yml`).
+
+Paper Trail offers a simple way to notify users
+that they need to upgrade to Paper by providing
+a stub `JavaPlugin` that prints a helpful message
+on startup and then disables itself.
+An alternate message is used if the server is
+running Paper, but the version is too old to 
+support the Paper plugin system.
+
+### How to Use
+
+Add the PaperMC repository (`https://repo.papermc.io/repository/maven-public/`) to your build script
+and shade `io.papermc:paper-trail:0.0.1-SNAPSHOT`
+into your plugin.
+It is recommended to relocate the `io.papermc.papertrail`
+package to avoid conflicts.
+
+To use Paper Trail, add a
+`plugin.yml` to your plugin with 
+`io.papermc.papertrail.RequiresPaperPlugins`
+as the "main" class. 
+If you relocated the package, be sure to adjust 
+the class name in the yaml accordingly.
+
+### License
+
+Paper Trail is licensed under the MIT License.
+See the [LICENSE](LICENSE) file for more information.

src/main/java/io/papermc/papertrail/RequiresPaperPlugins.java

@@ -21,7 +21,8 @@ private void printInformation() {
         final List<String> lines = new ArrayList<>(Arrays.asList("", Util.EQUALS_LINE));
         lines.addAll(Util.PAPER ? this.outdatedPaper() : this.requiresPaper());
         lines.add(Util.EQUALS_LINE);
-        this.getLogger().log(Level.SEVERE, String.join("\n", lines), new UnsupportedPlatformException("Unsupported platform"));
+        this.getLogger().log(Level.SEVERE, String.join("\n", lines),
+            new UnsupportedPlatformException("Unsupported platform"));
     }
 
     private void disable() {
@@ -30,7 +31,12 @@ private void disable() {
 
     private List<String> outdatedPaper() {
         final String pluginName = this.getDescription().getName();
-        return Arrays.asList(" " + pluginName + " requires Paper 1.19.4 or newer.");
+        return Arrays.asList(
+            " " + pluginName + " requires a newer version of Paper.",
+            " You can often find a list of supported game versions",
+            " at the webpage you obtained the plugin from. You could",
+            " also contact the plugin author for assistance."
+        );
     }
 
     private List<String> requiresPaper() {