Add optional dependency for paths++

Author: DarkTerraYT

ExampleMod.cs

@@ -14,6 +14,7 @@
 
 [assembly: MelonInfo(typeof(ExampleMod.ExampleMod), ModHelperData.Name, ModHelperData.Version, ModHelperData.RepoOwner)]
 [assembly: MelonGame("Ninja Kiwi", "BloonsTD6")]
+[assembly: MelonOptionalDependencies("PathsPlusPlus")]
 
 namespace ExampleMod;