personal/q3k/minecraft: add worldedit+worldguard

This assumes that a new Docker image will be built at tag spigot-1.15.2-r3.

Change-Id: Ia230510d2400faa3631bde99a96366d72e69a4bd
diff --git a/personal/q3k/minecraft/LICENSE.thirdparty.txt b/personal/q3k/minecraft/LICENSE.thirdparty.txt
new file mode 100644
index 0000000..4444b16
--- /dev/null
+++ b/personal/q3k/minecraft/LICENSE.thirdparty.txt
@@ -0,0 +1,7 @@
+WorldEdit and WorldGuard are licensed under the terms of the GNU Lesser General
+Public License v3.
+
+Full license texts are available at:
+
+* WorldEdit: https://github.com/EngineHub/WorldEdit/blob/7.1.0/LICENSE.txt
+* WorldGuard: https://github.com/EngineHub/WorldGuard/blob/7.0.2/LICENSE.txt