Initial project setup for SilkSpawners mod

Add SilkSpawners mod source files, configuration, mixins, Gradle build scripts, and metadata for Fabric. Implements spawner drop logic, config loading/saving, and required interfaces/mixins for custom spawner behavior.

gradle.properties

@@ -0,0 +1,15 @@
+# Done to increase the memory available to gradle.
+org.gradle.jvmargs=-Xmx1G
+# Fabric Properties
+# check these on https://modmuss50.me/fabric.html
+minecraft_version=1.21.11
+yarn_mappings=1.21.11+build.3
+loader_version=0.18.4
+loom_version=1.14-SNAPSHOT
+# Mod Properties
+mod_version=1.0
+maven_group=com.kasetoatz
+archives_base_name=SilkSpawners
+# Dependencies
+# check this on https://modmuss50.me/fabric.html
+fabric_version=0.140.2+1.21.11