chore: initialize monorepo scaffold with npm workspaces

packages/core/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "@visionl/core",
+  "version": "0.1.0",
+  "private": true,
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "scripts": {
+    "typecheck": "tsc -b",
+    "build": "tsc -b"
+  }
+}