Add type definitions for cfn-response package.

types/cfn-response/cfn-response-tests.ts

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+import * as cfn from "cfn-response";
+import { CloudFormationCustomResourceEvent, Context } from "aws-lambda";
+
+declare const event: CloudFormationCustomResourceEvent;
+declare const context: Context;
+
+// $ExpectType void
+cfn.send(event, context, cfn.SUCCESS, { sample: 123 }, "abc");
+// $ExpectType void
+cfn.send(event, context, "SUCCESS");
+// $ExpectError
+cfn.send(event, context, "", {});

types/cfn-response/index.d.ts

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+// Type definitions for cfn-response 1.0
+// Project: https://github.com/LukeMizuhashi/cfn-response
+// Definitions by: Ivo Murrell <https://github.com/ivoisbelongtous>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import { CloudFormationCustomResourceEvent, Context } from "aws-lambda";
+
+export type ResponseStatus = "SUCCESS" | "FAILED";
+export const SUCCESS: ResponseStatus;
+export const FAILED: ResponseStatus;
+
+export function send(
+    event: CloudFormationCustomResourceEvent,
+    context: Context,
+    responseStatus: ResponseStatus,
+    responseData?: object,
+    physicalResourceId?: string
+): void;

types/cfn-response/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+	"strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "cfn-response-tests.ts"
+    ]
+}

types/cfn-response/tslint.json

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+{ "extends": "dtslint/dt.json" }