chore: bootstrap monorepo with shared package

packages/shared/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "@flashcard/shared",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "typecheck": "tsc --noEmit",
+    "build": "tsc --noEmit"
+  },
+  "dependencies": {
+    "zod": "^3.23.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.5.0"
+  }
+}

packages/shared/src/index.ts

@@ -0,0 +1 @@
+export {};

packages/shared/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src"
+  },
+  "include": ["src/**/*"]
+}