Add an example project that uses ttypescript

Signed-off-by: moznion <moznion@mail.moznion.net>

Author: moznion

examples/ttypescript/.gitignore

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+*.d.ts
+*.js

examples/ttypescript/README.md

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+# Using [ttypescript](https://github.com/cevek/ttypescript) example
+
+## How to run
+
+```
+npm run run
+```
+
+Please see also [package.json](./package.json) and [tsconfig.json](./tsconfig.json).
+

examples/ttypescript/index.ts

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+import { dynamodbRecord } from '../../index';
+import { AttributeValue } from '@aws-sdk/client-dynamodb';
+
+interface User {
+  readonly id: number;
+  readonly name: string;
+  readonly tags: Map<string, string>;
+}
+
+const record: Record<string, AttributeValue> = dynamodbRecord<User>({
+  id: 12345,
+  name: 'John Doe',
+  tags: new Map<string, string>([
+    ['foo', 'bar'],
+    ['buz', 'qux'],
+  ]),
+});
+
+console.log(JSON.stringify(record));

examples/ttypescript/package-lock.json

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+{
+  "name": "ttypescript",
+  "version": "0.0.0",
+  "main": "index.js",
+  "scripts": {
+    "run": "ttsc ./index.ts && node ./index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "license": "MIT"
+}

examples/ttypescript/package.json

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+{
+  "compileOnSave": true,
+  "compilerOptions": {
+    "target": "es2016",
+    "lib": [],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "strict": true,
+
+    "plugins": [
+      {
+        "transform": "../../transformer.ts"
+      }
+    ]
+  }
+}
+