Add a note about deleting pom.xml in first patch

patches/server/0001-Setup-Gradle-project.patch

@@ -3,6 +3,9 @@ From: Kyle Wood <demonwav@gmail.com>
 Date: Thu, 10 Dec 2020 20:54:19 -0800
 Subject: [PATCH] Setup Gradle project
 
+The pom.xml file is deleted in this patch so the patch will fail to
+apply if there are changes made to it from upstream - thus notifying us
+that changes were made.
 
 diff --git a/.gitignore b/.gitignore
 index 67fb370cad6924895a6b27052dbd5c1767e3f0c9..3e05459f27c4c5697ae65da504d67a6a2f617b57 100644