Add initial KubeJS setup with README, configuration files, and example scripts

- Created README.txt with directory structure and usage information.
- Added common.json, client.json, and web_server.json for configuration settings.
- Introduced example server and startup scripts (main.js) for demonstration.
- Included example textures for blocks and items in the assets directory.

kubejs/README.txt

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+Find out more info on the website: https://kubejs.com/
+
+Directory information:
+
+assets - Acts as a resource pack, you can put any client resources in here, like textures, models, etc. Example: assets/kubejs/textures/item/test_item.png
+data - Acts as a datapack, you can put any server resources in here, like loot tables, functions, etc. Example: data/kubejs/loot_tables/blocks/test_block.json
+
+startup_scripts - Scripts that get loaded once during game startup - Used for adding items and other things that can only happen while the game is loading (Can be reloaded with /kubejs reload_startup_scripts, but it may not work!)
+server_scripts - Scripts that get loaded every time server resources reload - Used for modifying recipes, tags, loot tables, and handling server events (Can be reloaded with /reload)
+client_scripts - Scripts that get loaded every time client resources reload - Used for JEI events, tooltips and other client side things (Can be reloaded with F3+T)
+
+config - KubeJS config storage. This is also the only directory that scripts can access other than world directory
+exported - Data dumps like texture atlases end up here
+
+You can find type-specific logs in logs/kubejs/ directory

kubejs/client_scripts/main.js

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+// Visit the wiki for more info - https://kubejs.com/
+console.info('Hello, World! (Loaded client example script)')
+

kubejs/config/client.json

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+{
+  "window_title": "",
+  "disable_recipe_book": false,
+  "export_atlases": false,
+  "blur_scaled_pack_icon": true,
+  "custom_stack_size_text": true,
+  "shrink_stack_size_text": true
+}

kubejs/config/common.json

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+{
+  "hide_server_script_errors": false,
+  "server_only": false,
+  "announce_reload": true,
+  "packmode": "",
+  "save_dev_properties_in_config": false,
+  "allow_async_streams": true,
+  "match_json_recipes": true,
+  "ignore_custom_unique_recipe_ids": false,
+  "startup_error_gui": true,
+  "startup_error_report_url": "",
+  "remove_slot_limit": false,
+  "default_max_stack_size": 0,
+  "creative_mode_tab_icon": {},
+  "creative_mode_tab_name": null
+}

kubejs/config/web_server.json

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+{
+  "enabled": true,
+  "port": 61423,
+  "public_address": "",
+  "auth": "XBOSSC1-zyyA1JJ7rO_8zzJwodH9_Szk7tLwj1tt-6cb"
+}

kubejs/startup_scripts/main.js

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+// Visit the wiki for more info - https://kubejs.com/
+console.info('Hello, World! (Loaded startup example script)')
+