Initial commit

Added support for entity capture and spawning with eggs
Added README
Added spigot docker build tools
Added some comments

install.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+export REV="1.21.10"
+export M2_DIRECTORY="$M2_REPOSITORY"
+export BUILD_DIRECTORY="$ARTIFACT_DIRECTORY"
+export JAVA_VERSION="21"
+
+REPOSITORY_DIR=$(dirname "$0")
+
+cd "$REPOSITORY_DIR"
+
+git submodule update --init --recursive --remote
+
+./.git-submodules/spigot-docker-build-tools/run.sh mvn clean package