新增说明文件；新增kiwix-serve、papermc示例；更新README.md文件

examples/papermc/paper/example/world/datapacks/bukkit/pack.mcmeta

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+{
+    "pack": {
+        "description": "Data pack for resources provided by Bukkit plugins",
+        "pack_format": 15
+    }
+}

examples/papermc/paper/example/world/paper-world.yml

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+# This is a world configuration file for Paper.
+# This file may start empty but can be filled with settings to override ones in the config/paper-world-defaults.yml
+# 
+# World: world (minecraft:overworld)
+
+_version: 30

examples/papermc/paper/example/world/session.lock

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+☃

examples/papermc/paper/example/world/uid.dat

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+<EFBFBD><EFBFBD><EFBFBD>o<1D>EZ<45>!