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.

src/main/resources/fabric.mod.json

@@ -0,0 +1,25 @@
+{
+  "schemaVersion": 1,
+  "id": "silkspawners",
+  "version": "${version}",
+  "name": "SilkSpawners",
+  "description": "",
+  "authors": [],
+  "contact": {},
+  "license": "MIT",
+  "icon": "assets/silkspawners/icon.png",
+  "environment": "*",
+  "entrypoints": {
+    "main": [
+      "com.kasetoatz.silkspawners.SilkSpawners"
+    ]
+  },
+  "mixins": [
+    "silkspawners.mixins.json"
+  ],
+  "depends": {
+    "fabricloader": ">=${loader_version}",
+    "fabric-api": "*",
+    "minecraft": "${minecraft_version}"
+  }
+}