Initial project scaffold for VS Vineyard mod

Sets up C# .NET 8 project with modinfo.json, ModSystem entry point,
full asset directory structure, .gitignore, and README.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

resources/modinfo.json

@@ -0,0 +1,15 @@
+{
+  "type": "code",
+  "modid": "vsvineyard",
+  "name": "VS Vineyard",
+  "version": "0.1.0",
+  "description": "Adds viticulture and winemaking to Vintage Story — grow grape vines, harvest grapes, press juice, ferment and age wine in barrels.",
+  "authors": ["VSVineyard Contributors"],
+  "website": "",
+  "dependencies": {
+    "game": "1.19.0"
+  },
+  "side": "Universal",
+  "requiredOnClient": true,
+  "requiredOnServer": true
+}